Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 200310
Title:
Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands
Edition: Version 1.0
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Madison, WI, USA
Publisher: U.S. Geological Survey
Online_Linkage: <http://nationalatlas.gov/atlasftp.html>
Description:
Abstract:
This map layer contains the shallowest principal aquifers of the
conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin
Islands, portrayed as polygons.  The map layer was developed as part of
the effort to produce the maps published at 1:2,500,000 in the printed
series "Ground Water Atlas of the United States".  The published maps
contain base and cultural features not included in these data.  This is a
replacement for the July 1998 map layer called Principal Aquifers of the
48 Conterminous United States.
Purpose:
These data are intended for use in publications, at a scale of 1:2,500,000
or smaller.  Due to the small scale, the primary intended use is for
regional and national data display and analysis, rather than specific
local data analysis.
Supplemental_Information:
The Ground Water Atlas of the United States (GWA) chapters include
additional information that may be relevant to the use of this map layer,
such as maps of alluvial and glacial aquifers that overlie the aquifers in
this map layer, as well as other information described below.

The areal extent of the aquifers, as shown in this map layer, represents
the area in which a named aquifer is the shallowest of the principal
aquifers.  These aquifer areas are not necessarily the only areas in which
ground water can be withdrawn, for two reasons:  1) The aquifers shown may
have a larger areal extent than is represented here.  The boundaries in
this map layer generally represent an interpretation of the surface
location (outcrop), or near-surface location (shallow subcrop) of the
uppermost principal aquifer for the area.  An aquifer may extend beyond
the area shown, but be overlain by one or more other aquifers, and (or)
low-permeability material.  2) There may be areas of water-bearing
surficial material not shown in this map layer.  Major alluvial aquifers
that occur along main watercourses are not shown.  Significant
unconsolidated sand and gravel aquifers, that are not indicated in this
map layer but are important sources of water, may occur locally in
glaciated regions.  The user of this map layer is advised that to get
complete information regarding areas that serve as sources of water, more
information about surficial aquifers needs to be obtained, particularly in
glaciated areas.

This map layer was constructed by combining data created for or from the
regional GWA chapters.  Minor aquifers that are important local sources of
water were mapped in some regions, so the regional maps in the GWA may
show more detail than this map layer.  The data were reviewed, adjusted,
and published based on new information provided by national, State, and
local scientists.  The juxtaposition of regionally mapped aquifers has led
to some instances where an aquifer outcrop or shallow subcrop is bounded
by a State line.  This is a result of the regional mapping and national
categorization methods used and is not meant to imply a hydrogeologic
change coincident with a State boundary.

The aquifer outcrop and shallow subcrop boundaries represent broad,
regional categories and should not be interpreted as site-specific.
Comments regarding the names of aquifers or the hydrogeologic
interpretation of the aquifers can be directed to the U.S. Geological
Survey, Water Resources Division, Office of Ground Water,
ogw_webmaster@usgs.gov.

This map layer was used as part of the effort to publish a 1:5,000,000-
scale 'Principal Aquifers' map in the National Atlas of the United States
of America series of printed maps.  The printed map can be considered  a
representation of this map layer with the exceptions of: the smaller
scale, slight differences in the coastline due to generalization, base and
cultural information, and delineation of the glacial-deposit area.

These data were developed in conjunction with the publication of the GWA.
For documentation purposes, areas are referred to by their corresponding
GWA chapter letter, or by State.  This list shows the relationship between
State names and GWA chapters:
>HA 730-B        Segment 1-California, Nevada
>HA 730-C        Segment 2-Colorado, Utah, New Mexico, Arizona
>HA 730-D        Segment 3-Kansas, Missouri, Nebraska
>HA 730-E        Segment 4-Texas, Oklahoma
>HA 730-F        Segment 5-Arkansas, Louisiana, Mississippi
>HA 730-G        Segment 6-Alabama, Florida, Georgia, South Carolina
>HA 730-H        Segment 7-Idaho, Oregon, Washington
>HA 730-I        Segment 8-Montana, North Dakota, South Dakota, Wyoming
>HA 730-J        Segment 9-Iowa, Michigan, Minnesota, Wisconsin
>HA 730-K        Segment 10-Illinois, Indiana, Kentucky, Ohio, Tennessee
>HA 730-L        Segment 11-Delaware, Maryland, New Jersey, North
>                           Carolina, Pennsylvania, Virginia, West
>                           Virginia
>HA 730-M        Segment 12-Connecticut, Maine, Massachusetts, New
>                           Hampshire, New York, Rhode Island, Vermont
>HA 730-N        Segment 13-Alaska, Hawaii, Puerto Rico, and the U.S.
>                           Virgin Islands
Refer to <http://capp.water.usgs.gov/gwa/gwa.html> for a graphic depiction
of the GWA chapter regions, as well as more information about the GWA.

It may be helpful to refer to the printed GWA chapters when using the
Data, however, there are significant differences between this national
map layer and the printed chapters.  Because the GWA regional chapters
were written by different authors, there were areas of different
interpretations and category delineations, aquifer names, etc., that
became apparent when combining the regions.

The following listings show the differences between aquifer names in the
GWA chapters and the aq_name and aq_code used in this map layer.  See the
Entity and Attribute Information section for definitions of the data
attributes.

>GWA chapter HA 730-B
>Name from fig 11, page B4     aq_code-aq_name
>____________________________________________________________
>Basin and Range volcanic-     601-Southern Nevada
>rock aquifers                     volcanic-rock aquifers
>
>Coastal Basins aquifers       103-California Coastal Basin
>                                  aquifers
>
>Northern California Basin     104-Pacific Northwest
>fill aquifers                     basin-fill aquifers
>
>
>GWA chapter HA 730-C
>Name from fig 11, page C4
>____________________________________________________________
>Names and categories the same
>
>
>GWA chapter HA 730-D
>Name from fig 5, page D4      aq_code-aq_name
>____________________________________________________________
>Mississippi embayment         109-Mississippi River Valley
>aquifer system                    alluvial aquifer
>
>Great Plains aquifer          304-Lower Cretaceous
>                                  aquifers
>
>Confining unit                999-Other rocks
>
>Dune sand                     107-High Plains aquifer
>
>
>GWA chapter HA 730-E
>Name from fig 4, page E3      aq_code-aq_name
>____________________________________________________________
>EDWARDS-TRINITY AQUIFER SYSTEM
>Edwards-Trinity aquifer       501-Edwards-Trinity aquifer
>                                  system
>
>Edwards aquifer               501-Edwards-Trinity aquifer
>                                  system
>
>Trinity aquifer               501-Edwards-Trinity aquifer
>                                  system
>
>Confining unit                999-Other rocks
>
>
>GWA chapter HA 730-F
>Name from fig 7, page 4       aq_code-aq_name
>____________________________________________________________
>MAJOR AQUIFER SYSTEMS
>Surficial aquifer system      109-Mississippi River Valley
>                                  alluvial aquifer
>                              203-Mississippi embayment
>                                  aquifer system
>                              501-Edwards-Trinity aquifer
>                                  system
>                              999-Other rocks
>
>Mississippi embayment         109-Mississippi River Valley
>aquifer system                    alluvial aquifer
>                              203-Mississippi embayment
>                                  aquifer system
>                              204-Southeastern Coastal
>                                  Plain aquifer system
>                              999-Other rocks
>
>Tokio-Woodbine aquifer        999-Other rocks
>
>Ouachita Mountains aquifer    999-Other rocks
>
>CONFINING SYSTEMS AND CONFINING UNITS
>Western Interior Plains       999-Other rocks
>confining systems
>
>Confining unit                109-Mississippi River Valley
>                                  alluvial aquifer
>                              203-Mississippi embayment
>                                  aquifer system
>                              999-Other rocks
>
>
>GWA chapter HA 730-G
>Name from fig 3, page 3       aq_code-aq_name
>____________________________________________________________
>Sand and gravel aquifer       201-Coastal lowlands aquifer
>                                  system
>
>Piedmont and Blue Ridge       611-Piedmont and Blue Ridge
>aquifers                          crystalline-rock aquifers
>
>Appalachian Plateaus          310-Pennsylvanian aquifers
>aquifers
>
>Interior Low Plateaus         503-Mississippian aquifers
>aquifers
>
>Confining unit                999-Other rocks
>
>
>GWA chapter HA 730-H
>Name from fig 5, page H4      aq_code-aq_name
>____________________________________________________________
>Unconsolidated-deposit        101-Basin and Range basin-fill
> aquifers                         aquifers
>                              104-Pacific Northwest
>                                  basin-fill aquifers
>                              105-Northern Rocky Mountains
>                                  Intermontane Basins
>                                  aquifer system
>                              112-Puget Sound aquifer system
>
>
>Pliocene and younger          606-Snake River Plain
>basaltic-rock aquifers            basaltic-rock aquifers
>                              610-Pacific Northwest
>                                  basaltic-rock aquifers
>
>Miocene basaltic-rock         606-Snake River Plain
>aquifers                          basaltic-rock aquifers
>                              607-Columbia Plateau basaltic-rock
>                                  aquifers
>                              610-Pacific Northwest
>                                  basaltic-rock aquifers
>
>Aquifers in pre-Miocene       401-Basin and Range
>rocks                             carbonate-rock aquifers
>                              999-Other rocks
>
>
>GWA chapter HA 730-I.  See Process Description regarding
>differences between this data and the printed Ground Water
>Atlas chapter in Western Montana
>Name from fig 7, page I4      aq_code-aq_name
>____________________________________________________________
>Quaternary volcanic and       610-Pacific Northwest
>sedimentary rock aquifers         basaltic-rock aquifers
>
>Upper Tertiary aquifers       105-Northern Rocky Mountains
>                                  Intermontane Basins
>                                  aquifer system
>                              107-High Plains aquifer
>                              314-Lower Tertiary aquifers
>                              316-Wyoming Tertiary aquifers
>
>Lower Tertiary aquifers       107-High Plains aquifer
>                              314-Lower Tertiary aquifers
>
>Upper Cretaceous aquifers     301-Colorado Plateaus
>                                  aquifers
>                              315-Upper Cretaceous
>                                  aquifers
>
>Lower Cretaceous aquifers     301-Colorado Plateaus
>                                  aquifers
>                              304-Lower Cretaceous aquifers
>
>Confining unit                301-Colorado Plateaus
>                                  aquifers
>
>
>GWA chapter HA 730-J
>Name from fig 7, page J4      aq_code-aq_name
>____________________________________________________________
>Cretaceous aquifer            304-Lower Cretaceous
>                                  aquifers
>
>MISSISSIPPIAN AQUIFER
>Carbonate rocks               503-Mississippian aquifers
>
>Sandstone                     311-Marshall aquifer
>
>Crystalline-rock aquifer      999-Other rocks
>
>Confining unit                312-Cambrian-Ordovician
>                                  aquifer system
>                              999-Other rocks
>
>
>GWA chapter HA 730-K
>Name from fig 5, page K4      aq_code-aq_name
>____________________________________________________________
>Blue Ridge aquifers           611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>MISSISSIPPI EMBAYMENT AQUIFER SYSTEM
>Upper Claiborne, middle       109-Mississippi River Valley
>Claiborne, middle Wilcox,         alluvial aquifer
>and lower Wilcox              203-Mississippi embayment
>                                  aquifer system
>
>McNairy-Nacatoch              204-Southeastern Coastal
>                                  Plain aquifer system
>
>Pennsylvanian aquifers        999-Other rocks
>
>Confining unit                999-Other rocks
>
>
>GWA chapter HA 730-L
>Name from fig 7, page L4      aq_code-aq_name
>____________________________________________________________
>NORTHERN ATLANTIC COASTAL PLAIN AQUIFER SYSTEM
>Surficial aquifer             111-Surficial aquifer system
>                              205-Northern Atlantic
>                                  Coastal Plain aquifer
>                                  system
>
>Chesapeake aquifer            205-Northern Atlantic
>                                  Coastal Plain aquifer
>                                  system
>
>Castle Hayne-Aquia aquifer    418-Castle Hayne aquifer
>
>Severn-Magothy aquifer        205-Northern Atlantic
>                                  Coastal Plain aquifer
>                                  system
>
>Peedee-upper Cape Fear        205-Northern Atlantic
>aquifer                           Coastal Plain aquifer
>                                  system
>
>Potomac aquifer               205-Northern Atlantic
>                                  Coastal Plain aquifer
>                                  system
>
>PIEDMONT AND BLUE RIDGE AQUIFERS
>Aquifers in early Mesozoic    308-Early Mesozoic basin
>basins                            aquifers
>
>Carbonate-rock aquifers       417-Piedmont and Blue Ridge
>                                  carbonate-rock aquifers
>
>Crystalline-rock aquifers     611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>Valley and Ridge              416-New York and New England
>carbonate-rock aquifers           carbonate-rock aquifers
>                              505-Valley and Ridge
>                                  carbonate-rock aquifers
>
>APPALACHIAN PLATEAUS
>Permian and Pennsylvanian     310-Pennsylvanian aquifers
>aquifers
>
>Not a principal aquifer       611-Piedmont and Blue Ridge
>                                  crystalline-rock aquifers
>
>
>GWA chapter HA 730-M
>Name from fig 10, page M5     aq_code-aq_name
>____________________________________________________________
>SANDSTONE AQUIFERS
>Mesozoic sandstone and        308-Early Mesozoic basin
>basalt of the Newark              aquifers
>Supergroup
>
>Lower Paleozoic               309-New York sandstone
>                                  aquifers
>
>CRYSTALLINE-ROCK AQUIFERS
>Adirondack                    999-Other rocks
>
>
>GWA chapter HA 730-N
>Hawaii name from fig 35,
>page N14
>Puerto Rico name from
>fig 71, page N24              aq_code-aq_name
>____________________________________________________________
>Volcanic rock aquifers        608-Hawaiian Volcanic-rock
>                                  aquifers
>                              609-Hawaiian Sedimentary
>                                  deposit aquifers
>
>MINOR AQUIFERS
>Coastal embayment aquifers    999-Other rocks
>Volcaniclastic-, igneous-,
>and sedimentary-rock aquifers
>
>Confining unit                999-Other rocks
>
>NORTHCOAST LIMESTONE AQUIFER SYSTEM
>Upper aquifer                 419-Puerto Rico North Coast Limestone
>                                  aquifer system
>
>Lower aquifer                 419-Puerto Rico North Coast Limestone
>                                  aquifer system
>
Related Spatial and Tabular Data Sets

A map layer showing the areal extent of sand and gravel aquifers of
alluvial and glacial origin north of the line of Quaternary continental
glaciation is included in the online, interactive National Atlas of the
United States.  This map layer ends at the southern limit of
glaciation in the United States; areas north of the limit line contain
significant sand and gravel glacial deposits that are important sources of
water for local areas.

For additional information on principal aquifers, please see the Aquifer
Basics page at <http://capp.water.usgs.gov/aquiferBasics/index.html>.

The final data are being served to the public in the following formats:
Spatial Data Transfer Standard (SDTS), Arc/INFO Export, or ArcView
Shapefile.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200310
Currentness_Reference:
Publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.755908
East_Bounding_Coordinate: -66.939561
North_Bounding_Coordinate: 49.385619
South_Bounding_Coordinate: 24.518322
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: Geoscientific information
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Aquifer
Theme_Keyword: Groundwater
Theme_Keyword: Hydrogeology
Theme_Keyword: Geohydrology
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alabama
Place_Keyword: Arizona
Place_Keyword: Arkansas
Place_Keyword: California
Place_Keyword: Colorado
Place_Keyword: Connecticut
Place_Keyword: Delaware
Place_Keyword: District of Columbia
Place_Keyword: Florida
Place_Keyword: Georgia
Place_Keyword: Hawaii
Place_Keyword: Idaho
Place_Keyword: Illinois
Place_Keyword: Indiana
Place_Keyword: Iowa
Place_Keyword: Kansas
Place_Keyword: Kentucky
Place_Keyword: Louisiana
Place_Keyword: Maine
Place_Keyword: Maryland
Place_Keyword: Massachusetts
Place_Keyword: Michigan
Place_Keyword: Minnesota
Place_Keyword: Mississippi
Place_Keyword: Missouri
Place_Keyword: Montana
Place_Keyword: Nebraska
Place_Keyword: Nevada
Place_Keyword: New Hampshire
Place_Keyword: New Jersey
Place_Keyword: New Mexico
Place_Keyword: New York
Place_Keyword: North Carolina
Place_Keyword: North Dakota
Place_Keyword: Ohio
Place_Keyword: Oklahoma
Place_Keyword: Oregon
Place_Keyword: Pennsylvania
Place_Keyword: Rhode Island
Place_Keyword: South Carolina
Place_Keyword: South Dakota
Place_Keyword: Tennessee
Place_Keyword: Texas
Place_Keyword: Utah
Place_Keyword: Vermont
Place_Keyword: Virginia
Place_Keyword: Washington
Place_Keyword: West Virginia
Place_Keyword: Wisconsin
Place_Keyword: Wyoming
Place_Keyword: Puerto Rico
Place_Keyword: U.S. Virgin Islands
Place_Keyword: United States
Access_Constraints: None
Use_Constraints:
None.  Acknowledgment of the Ground Water Atlas of the United States and
(or) the National Atlas of the United States of America would be appreciated
in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Chief, Cartographic and Publications Program, Water Resources Division
Contact_Address:
Address_Type: Mailing and physical address
Address:
505 Science Drive
City: Madison
State_or_Province: WI
Postal_Code: 53711-1061
Country: USA
Contact_Voice_Telephone: 608-238-9333
Data_Set_Credit:
This map layer was created and modified over a period of at least five years
by several staff members of the U.S. Geological Survey Water Resources
Discipline, Cartographic and Publications Program in Madison, Wisconsin.
Completion of this map layer and associated metadata was funded, in part,
under a cooperative joint funding agreement between the U.S. Geological
Survey and the U.S. Environmental Protection Agency.
Native_Data_Set_Environment:
SDTS, Arc/GIS 8.0.1, and ESRI Shapefile format.
Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 200209
Title:
Aquifers of Alluvial and Glacial Origin
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage: <http://nationalatlas.gov/atlasftp.html>
Back to Top
Data_Quality_Information:
Logical_Consistency_Report:
Polygon and chain-node topology are present.  Each polygon is closed and has
one label point.
Completeness_Report:
This map layer includes aquifer information for the 48 conterminous United
States, the District of Columbia, Hawaii, Puerto Rico, and the U.S. Virgin
Islands.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Planert, M. (comp.)
Originator: Williams, J.S. (comp.)
Publication_Date: 1995
Title:
Ground Water Atlas of the United States-Segment 1: California, Nevada
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-B
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-B
Source_Contribution:
Aquifer data for California and Nevada
Source_Information:
Source_Citation:
Citation_Information:
Originator: Robson, S.G. (comp.)
Originator: Banta, E.R. (comp.)
Publication_Date: 1995
Title:
Ground Water Atlas of the United States-Segment 2: Arizona, Colorado, New Mexico, Utah
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-C
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-C
Source_Contribution:
Aquifer data for Arizona, Colorado, New Mexico, and Utah
Source_Information:
Source_Citation:
Citation_Information:
Originator: Miller, J.A. (comp.)
Originator: Appel, C.L. (comp.)
Publication_Date: 1998
Title:
Ground Water Atlas of the United States-Segment 3: Kansas, Missouri, Nebraska
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-D
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-D
Source_Contribution:
Aquifer data for Kansas, Missouri, and Nebraska
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ryder, P.D. (comp.)
Publication_Date: 1996
Title:
Ground Water Atlas of the United States-Segment 4: Oklahoma, Texas
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-E
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1996
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-E
Source_Contribution:
Aquifer data for Oklahoma and Texas
Source_Information:
Source_Citation:
Citation_Information:
Originator: Renken, R.A. (comp.)
Publication_Date: 1998
Title:
Ground Water Atlas of the United States-Segment 5: Arkansas, Louisiana, Mississippi
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-F
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-F
Source_Contribution:
Aquifer data for Arkansas, Louisiana, and Mississippi
Source_Information:
Source_Citation:
Citation_Information:
Originator: Miller, J.A. (comp.)
Publication_Date: 1990
Title:
Ground Water Atlas of the United States-Segment 6: Alabama, Florida, Georgia, and South Carolina
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-G
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1990
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-G
Source_Contribution:
Aquifer data for Alabama, Florida, Georgia, and South Carolina
Source_Information:
Source_Citation:
Citation_Information:
Originator: Whitehead, R.L. (comp.)
Publication_Date: 1994
Title:
Ground Water Atlas of the United States-Segment 7: Idaho, Oregon, Washington
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-H
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1994
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-H
Source_Contribution:
Aquifer data for Idaho, Oregon, and Washington
Source_Information:
Source_Citation:
Citation_Information:
Originator: Whitehead, R.L. (comp.)
Publication_Date: 1996
Title:
Ground Water Atlas of the United States-Segment 8: Montana, North Dakota, South Dakota, Wyoming
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-I
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1996
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-I
Source_Contribution:
Aquifer data for Montana, North Dakota, South Dakota, and Wyoming
Source_Information:
Source_Citation:
Citation_Information:
Originator: Olcott, P.G. (comp.)
Publication_Date: 1992
Title:
Ground Water Atlas of the United States-Segment 9: Iowa, Michigan, Minnesota, Wisconsin
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-J
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-J
Source_Contribution:
Aquifer data for Iowa, Michigan, Minnesota, and Wisconsin
Source_Information:
Source_Citation:
Citation_Information:
Originator: Lloyd, O.B., Jr. (comp.)
Originator: Lyke, W.L. (comp.)
Publication_Date: 1995
Title:
Ground Water Atlas of the United States-Segment 10: Illinois, Indiana, Kentucky, Ohio, Tennessee
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-K
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-K
Source_Contribution:
Aquifer data for Illinois, Indiana, Kentucky, Ohio, and Tennessee
Source_Information:
Source_Citation:
Citation_Information:
Originator: Trapp, H., Jr. (comp.)
Originator: Horn, M.A. (comp.)
Publication_Date: 1997
Title:
Ground Water Atlas of the United States-Segment 11: Delaware, Maryland, New Jersey, North Carolina, Pennsylvania, Virginia, West Virginia
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-L
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-L
Source_Contribution:
Aquifer data for Delaware, Maryland, New Jersey, North Carolina,
Pennsylvania, Virginia, and West Virginia
Source_Information:
Source_Citation:
Citation_Information:
Originator: Olcott, P.G. (comp.)
Publication_Date: 1995
Title:
Ground Water Atlas of the United States-Segment 12: Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island, Vermont
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-M
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1995
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-M
Source_Contribution:
Aquifer data for Connecticut, Maine, Massachusetts, New Hampshire, New
York, Rhode Island, and Vermont
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey, Water Resources Division
Publication_Date: Unpublished material
Title:
National aquifers file
Geospatial_Data_Presentation_Form: Map
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1990
Ending_Date: 1993
Source_Currentness_Reference:
Publication or compilation date
Source_Citation_Abbreviation:
National aquifers file
Source_Contribution:
Preliminary aquifer map of the 48 conterminous States.
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Atlas of the United States
Publication_Date: 1998
Title:
State Boundaries of the United States
Geospatial_Data_Presentation_Form: Map
Publication_Information:
Publication_Place: Reston,VA
Publisher: U.S. Geological Survey
Online_Linkage: <http://nationalatlas.gov/atlasftp.html>
Source_Scale_Denominator: 2000000
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
Atlas-State boundaries
Source_Contribution:
Coastline and international boundary
Source_Information:
Source_Citation:
Citation_Information:
Originator: James. A. Miller (comp.)
Publication_Date: 19980701
Title:
Principal Aquifers of the Conterminous United States
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Publication_Information:
Publication_Place: Madison, WI, USA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 19980701
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
Atlas-principal aquifers_1998
Source_Contribution:
Aquifer data for the conterminous United States.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Oki, D.S. (comp.)
Originator: Gingerich, S.B. (comp.)
Originator: Whitehead, R.L. (comp.)
Publication_Date: 1999
Title:
Ground Water Atlas of the United States-Segment 13: Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands
Edition: 2.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-N
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 1000000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-N-HI
Source_Contribution:
Aquifer data for Hawaii.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Olcott, P.G. (comp.)
Publication_Date: 1999
Title:
Ground Water Atlas of the United States-Segment 13: Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands
Edition: 2.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Hydrologic Investigations Atlas
Issue_Identification: HA 730-N
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: Stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
GWA HA 730-N-PR
Source_Contribution:
Aquifer data for Puerto Rico and the U.S. Virgin Islands.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Vaccaro, J.J. (comp.)
Originator: Jones, M.A. (comp.)
Publication_Date: 1998
Title:
Hydrogeologic framework of the Puget Sound Aquifer system, Washington and British Columbia
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Professional Paper
Issue_Identification: PP 1424-D
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2000000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
PP 1424-D
Source_Contribution:
Dividing line between the Puget Sound Aquifer system and the Willamette
Lowland basin-fill aquifers.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Woodward, D.G. (comp.)
Originator: Gannett, M.W. (comp.)
Originator: Vaccaro, J.J. (comp.)
Publication_Date: 1998
Title:
Hydrogeologic framework of the Willamette Lowland aquifer system, Oregon and Washington
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Professional Paper
Issue_Identification: PP 1424-B
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 250000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
PP 1424-B
Source_Contribution:
Dividing line between the Puget Sound Aquifer system and the Willamette
Lowland basin-fill aquifers.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Westjohn, D.B. (comp.)
Originator: Weaver, T.L. (comp.)
Publication_Date: 1998
Title:
Hydrogeologic framework of the Michigan Basin regional aquifer System.
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Professional Paper
Issue_Identification: PP 1418
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1998
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
PP 1418
Source_Contribution:
Name change for the Marshall aquifer.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Batten, W.G. (comp.)
Originator: Brown, T.A. (comp.)
Originator: Mills, P.C. (comp.)
Originator: Sabin, T.J. (comp.)
Publication_Date: 1997
Title:
Rock-stratigraphic nomenclature, lithology, and subcrop area of the Galena-Platteville bedrock unit in Illinois and Wisconsin.
Edition: 1.0
Geospatial_Data_Presentation_Form: Map
Series_Information:
Series_Name: Water Resources Investigations Report
Issue_Identification: WRIR 97-4054-B, 1 sheet
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: CD-ROM
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference:
Publication date
Source_Citation_Abbreviation:
WRIR
Source_Contribution:
Aquifer data for the Cambrian-Ordovician Aquifer System extension in
Illinois.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished material
Title:
Hawaii Aquifers
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Source_Currentness_Reference:
Compilation date
Source_Citation_Abbreviation:
Hawaii aquifers
Source_Contribution:
Aquifers for Hawaii.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished material
Title:
Caribbean Aquifers
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2000
Source_Currentness_Reference:
Compilation date
Source_Citation_Abbreviation:
Caribbean aquifers
Source_Contribution:
Aquifers for Puerto Rico and the U.S. Virgin Islands.
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: Unpublished material
Title:
Principal Aquifers intermediate file
Source_Scale_Denominator: 2500000
Type_of_Source_Media: Internal file
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2001
Source_Currentness_Reference:
Compilation date
Source_Citation_Abbreviation:
Principal aquifers 2001 intermediate file
Source_Contribution:
Aquifer data for the conterminous United States.
Process_Step:
Process_Description:
Aquifer outcrop line work for each GWA chapter was compiled on mylar at
a scale of 1:2,000,000, and reduced to 1:2,500,000 for further
production work.  For chapters HA 730-G, -H, and -J, the outcrop lines
were scribed at a line width of 0.006 inch.  Film positives made from
the scribed materials were scanned on a drum scanner, vectorized, and
converted to Arc/INFO coverages.  For chapters HA 730-B, -C, -D, -E, -F,
-I, -K, -L, and -M, the aquifer compilation was either hand digitized,
and (or) scanned on a drum scanner, vectorized and converted to Arc/INFO
coverages.  The data were then checked, cleaned up, and attribute
creation was done.

The Arc/INFO coverages were plotted and checked against the source
compilations.  Polygons were attributed using Arcedit.  The coverages
for GWA chapters HA 730-B, -C, -D, -E, -F, -I, -K, -L, and -M were used
to generate output files that were imported into Adobe Illustrator
for map publication.  Each completed map, at a scale of 1:2,500,000, was
reviewed for content and accuracy by the chapter lead cartographer,
Water Resources Discipline Geohydrologic Map Editor, and chapter author.

Individual chapter coverages were appended into one continuous coverage.
Arcedit was used for edgematching and to remove duplicate labels.  No
DISSOLVE was done on the coverage; an equivalent of a DISSOLVE was done
manually in Arcedit in conjunction with attribute checking, by removing
arcs that divided adjacent polygons with the same attributes.  Several
iterations of editing were performed.  These mostly involved ensuring
all polygons had labels and aquifer information and ensuring polygons
had correct aquifer information.  No polygons were removed for
generalization.
Source_Used_Citation_Abbreviation:
HA 730-B
Source_Used_Citation_Abbreviation:
HA 730-C
Source_Used_Citation_Abbreviation:
HA 730-D
Source_Used_Citation_Abbreviation:
HA 730-E
Source_Used_Citation_Abbreviation:
HA 730-F
Source_Used_Citation_Abbreviation:
HA 730-G
Source_Used_Citation_Abbreviation:
HA 730-H
Source_Used_Citation_Abbreviation:
HA 730-I
Source_Used_Citation_Abbreviation:
HA 730-J
Source_Used_Citation_Abbreviation:
HA 730-K
Source_Used_Citation_Abbreviation:
HA 730-L
Source_Used_Citation_Abbreviation:
HA 730-M
Process_Date: 1993
Source_Produced_Citation_Abbreviation:
National aquifers file
Process_Step:
Process_Description:
Plots of the national aquifers file were made at 1:2,500,000, covering
the areas of the regional GWA chapters.  Each plot was compared to the
printed GWA chapter aquifer maps.  Where applicable (chapters HA 730-B,
-C, -D, -E, -F, -I, -K, - L, and -M), an Adobe Illustrator file of the
coverage data was compared on-screen with the Illustrator file used to
print the published map.  Discrepancies between the coverage file and
print file were noted, and the coverage updated to match the published
map.  Where a line appeared to shift noticeably (approximately 1/8 inch
at a scale of 1:2,500,000) across the boundary of two adjacent GWA
chapter regions, the line was adjusted for a smoother appearance.  The
adjustments may have been made on one or both sides of the region
boundary, depending on a cartographic assessment of the instance.

Coastline Location

The 1:2,500,000 principal aquifer maps in the Ground Water Atlas
publications used a coastline and international boundary, derived either
from the map separates from the National Atlas of the United States of
America (published 1970), or from the Digital Line Graph (DLG) data
created from the 1970 National Atlas.  GWA chapters HA 730-G, -J, and -H
used coastline and boundary filmwork  photo-mechanically reduced from
the 1:2,000,000 National Atlas map separates.  The remaining chapters
used coastline and boundary data from the DLG's.  A revision of the DLG
data took place in 1997, after the creation of the chapter aquifer map
data.

After the edgematching, a decision was made to replace the coast and
international boundary of this national-level aquifer data with one
derived from a newer version of 1997 DLG data.  State boundary data from
the National Atlas was used to provide the coastline and two aquifer
boundaries that coincide with State lines.

The existing outline (coastline and international boundary line) was
removed, the new outline added to the coverage, and the remaining
aquifer contact lines snapped to the new outline.  The coverage was re-
cleaned, data categories checked onscreen and with plots, and corrected.
Line and labeling corrections, such as undershoots, overshoots, and
improper labels were corrected in Arcedit.

There are some slight locational differences between this map layer and
the printed GWA chapters.  For example, there are  several small
differences in the number of small islands in coastal areas and the
categorization of these small islands was assigned to either the nearby
principal aquifer category or as Not a principal aquifer, depending on
the location and categorization of similar small islands in the printed
GWA chapters.  There are other differences in the categorization of some
land/shoreline-related features. For example, an area symbolized as a
bay in a GWA chapter may be land in this map layer.

Western Montana

During the review of a printed map made from this national-level aquifer
data, the compiler, James A. Miller, requested a change in the
representation of aquifers in western Montana.  The area affected is in
the following counties: Lincoln, Flathead, Sanders, Lake, Mineral,
Missoula, Powell, Ravalli, Granite, Lewis and Clark, Deer Lodge, Silver
Bow, Jefferson,  Broadwater, Gallatin, Beavershead, and Madison.  These
areas fall under the Northern Rocky Mountain Intermontane Basins
Regional Aquifer Systems Analysis (RASA).  With one exception, the
aquifers, as shown in GWA chapter I, figure 7 in the listed counties
were removed and replaced with unconsolidated-deposit areas as shown in
GWA chapter HA 730-I, figure 6.  The exception is an area in northern
Flathead county, listed as an Upper Tertiary aquifer in GWA chapter I,
figure 7, that was retained as an area but reclassified as a Lower
Tertiary aquifer.
Source_Used_Citation_Abbreviation:
National aquifer file
Source_Used_Citation_Abbreviation:
HA 730-B
Source_Used_Citation_Abbreviation:
HA 730-C
Source_Used_Citation_Abbreviation:
HA 730-D
Source_Used_Citation_Abbreviation:
HA 730-E
Source_Used_Citation_Abbreviation:
HA 730-F
Source_Used_Citation_Abbreviation:
HA 730-G
Source_Used_Citation_Abbreviation:
HA 730-H
Source_Used_Citation_Abbreviation:
HA 730-I
Source_Used_Citation_Abbreviation:
HA 730-J
Source_Used_Citation_Abbreviation:
HA 730-K
Source_Used_Citation_Abbreviation:
HA 730-L
Source_Used_Citation_Abbreviation:
HA 730-M
Source_Used_Citation_Abbreviation:
Atlas-State boundaries
Process_Date: 1997
Source_Produced_Citation_Abbreviation:
Atlas-principal Aquifers_1998
Process_Step:
Process_Description:
Aquifer data was taken from digital files created in Adobe Illustrator
for Ground Water Atlas chapter HA 730-N of Hawaii, Puerto Rico, and the
U.S. Virgin Islands.  Where polygons ended at the shoreline, National
Atlas State boundaries were used.  The final Illustrator file was
exported into a DXF file.  The DXF file was converted to a coverage.
Using the TRANSFORM command, the coverage containing the aquifer lines
was rubber-sheeted to the coverage containing registration tics, and was
then projected from geographic coordinates to Albers Equal-Area Conic
projection for verification purposes.  The aquifer coverage was cleaned,
the topology was built, and labels were added.  Attributes were added as
necessary.
Source_Used_Citation_Abbreviation:
Atlas-State boundaries
Source_Used_Citation_Abbreviation:
GWA HA 730-N-HI
Process_Date: 2000
Source_Produced_Citation_Abbreviation:
Hawaii aquifers
Process_Step:
Process_Description:
Aquifer data was taken from digital files created in Adobe Illustrator
for Ground Water Atlas chapter HA 730-N of Hawaii, Puerto Rico, and the
U.S. Virgin Islands.  Where polygons ended at the shoreline, National
Atlas State boundaries were used.  The final Illustrator file was
exported into a DXF file.  The DXF file was converted to a coverage.
Using the TRANSFORM command, the coverage containing the aquifer lines
was rubber-sheeted to the coverage containing registration tics, and was
then projected from geographic coordinates to Albers Equal-Area Conic
projection for verification purposes.  The aquifer coverage was cleaned,
the topology was built, and labels were added.  Attributes were added as
necessary.
Source_Used_Citation_Abbreviation:
Atlas-State boundaries
Source_Used_Citation_Abbreviation:
GWA HA 730-N-PR
Process_Date: 2000
Source_Produced_Citation_Abbreviation:
Caribbean aquifers
Process_Step:
Process_Description:
The Principal Aquifers map published in 1998 was reviewed and modified,
resulting in 57 aquifers, 36 of which were the same geographically as in
the 1998 publication.  Aquifers were aggregated, divided, renamed and
updated from more recent publications, using a variety of techniques,
which include scanning, importing unpublished digital data and paper
compilation at 1:2,500,000 scale.  The updated Adobe Illustrator aquifer
data was exported into a DXF file.  The DXF file was converted to a
coverage.  Using the TRANSFORM command, the coverage containing the
aquifer lines was rubber-sheeted to the coverage containing registration
tics, and was then projected from geographic coordinates to Albers
Equal-Area Conic projection for verification purposes.  The aquifer
coverage was cleaned, the topology was built, and labels were added.
Attributes were added as necessary.
Source_Used_Citation_Abbreviation:
Atlas-principal Aquifers_1998
Source_Used_Citation_Abbreviation:
HA 730-B
Source_Used_Citation_Abbreviation:
HA 730-C
Source_Used_Citation_Abbreviation:
HA 730-D
Source_Used_Citation_Abbreviation:
HA 730-E
Source_Used_Citation_Abbreviation:
HA 730-F
Source_Used_Citation_Abbreviation:
HA 730-G
Source_Used_Citation_Abbreviation:
HA 730-H
Source_Used_Citation_Abbreviation:
HA 730-I
Source_Used_Citation_Abbreviation:
HA 730-J
Source_Used_Citation_Abbreviation:
HA 730-K
Source_Used_Citation_Abbreviation:
HA 730-L
Source_Used_Citation_Abbreviation:
HA 730-M
Source_Used_Citation_Abbreviation:
PP 1424-D
Source_Used_Citation_Abbreviation:
PP 1424-B
Source_Used_Citation_Abbreviation:
PP 1418
Source_Used_Citation_Abbreviation:
WRIR
Process_Date: 2001
Source_Produced_Citation_Abbreviation:
Principal aquifers 2001 intermediate file
Process_Step:
Process_Description:
The Principal Aquifers coverages of Hawaii, Puerto Rico, and the U.S.
Virgin Islands were merged with the coverage of the conterminous United
States.  The coverage was read into ArcGIS and both a personal
geodatabase and a shapefile were created.
Source_Used_Citation_Abbreviation:
Principal aquifers 2001 intermediate file
Source_Used_Citation_Abbreviation:
Hawaii aquifers
Source_Used_Citation_Abbreviation:
Caribbean aquifers
Process_Date: 2003
Process_Step:
Process_Description:
Metadata imported.
Source_Used_Citation_Abbreviation:
C:\DOCUME~1\ISANTI~1\LOCALS~1\Temp\xml1C8B.tmp
Process_Date: 20090629
Process_Time: 09500900
Process_Step:
Process_Description:
Dataset copied.
Source_Used_Citation_Abbreviation:
Server=OGP19127; Service=5151; Database=GISOTG; User=gisadmin; Version=sde.DEFAULT
Process_Date: 20100927
Process_Time: 15025200
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 4637
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 18.033333
Standard_Parallel: 18.433333
Longitude_of_Central_Meridian: -66.433333
Latitude_of_Projection_Origin: 17.833333
False_Easting: 200000.000000
False_Northing: 200000.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000100
Ordinate_Resolution: 0.000100
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 1.000000
Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
Back to Top
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Aquifer (described by aquifrp025 or aquifrp025.dbf)
Entity_Type_Definition:
A formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs.
Entity_Type_Definition_Source:
U.S. Geological Survey
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition:
Internal feature number.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition:
The representation of the entity in the data.
Attribute_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Polygon
Enumerated_Domain_Value_Definition:
2-dimensional element
Enumerated_Domain_Value_Definition_Source:
ESRI GIS software
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: Rock_name
Attribute_Definition:
The name of the permeable geologic material that composes the aquifer.
Attribute_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Carbonate-rock aquifers
Enumerated_Domain_Value_Definition:
Formations composed of limestone and (or) dolomite.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Igneous and metamorphic-rock aquifers
Enumerated_Domain_Value_Definition:
Formations composed of volcanic rocks.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sandstone and carbonate-rock aquifers
Enumerated_Domain_Value_Definition:
Formations composed of sandstone, limestone, and (or) dolomite.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Sandstone aquifers
Enumerated_Domain_Value_Definition:
Formations composed of sandstone.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Semiconsolidated sand aquifers
Enumerated_Domain_Value_Definition:
Formations partially solidified sand.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Unconsolidated sand and gravel aquifers
Enumerated_Domain_Value_Definition:
Formations composed of loose sand and gravel.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <blank>
Enumerated_Domain_Value_Definition:
Other rocks.  Rocks that are generally poorly permeable but locally
may contain productive aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute:
Attribute_Label: Rock_type
Attribute_Definition:
The code number relating to the rock_name.
Attribute_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 100
Enumerated_Domain_Value_Definition:
Unconsolidated sand and gravel aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 200
Enumerated_Domain_Value_Definition:
Semiconsolidated sand aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 300
Enumerated_Domain_Value_Definition:
Sandstone aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 400
Enumerated_Domain_Value_Definition:
Carbonate-rock aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 500
Enumerated_Domain_Value_Definition:
Sandstone and carbonate-rock aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 600
Enumerated_Domain_Value_Definition:
Igneous and metamorphic-rock aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 999
Enumerated_Domain_Value_Definition:
Areas that are other rocks.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute:
Attribute_Label: Aq_name
Attribute_Definition:
The aquifer unit name.
Attribute_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: (see table below)
Enumerated_Domain_Value_Definition:
The names used in this map layer are listed below.  There should be
a direct correlation between the values of the rock_type and
rock_name attributes, and between the aq_name and aq_code
attributes.  The aq_names are as follows:
>aq_code -- aq_name
>101 -- Basin and Range basin-fill aquifers
>102 -- Rio Grande aquifer system
>103 -- California Coastal Basin aquifers
>104 -- Pacific Northwest basin-fill aquifers
>105 -- Northern Rocky Mountains Intermontane Basins aquifer system
>106 -- Central Valley aquifer system
>107 -- High Plains aquifer
>108 -- Pecos River Basin alluvial aquifer
>109 -- Mississippi River Valley alluvial aquifer
>110 -- Seymour aquifer
>111 -- Surficial aquifer system
>112 –- Puget Sound aquifer system
>114 –- Puerto Rico south coast aquifer
>115 –- Willamette Lowland basin-fill aquifers
>116 –- Columbia Plateau basin-fill aquifers
>117 –- Snake River Plain basin-fill aquifers
>201 -- Coastal lowlands aquifer system
>202 -- Texas coastal uplands aquifer system
>203 -- Mississippi embayment aquifer system
>204 -- Southeastern Coastal Plain aquifer system
>205 -- Northern Atlantic Coastal Plain aquifer system
>301 -- Colorado Plateaus aquifers
>302 -- Denver Basin aquifer system
>304 -- Lower Cretaceous aquifers
>305 -- Rush Springs aquifer
>306 -- Central Oklahoma aquifer
>307 -- Ada-Vamoosa aquifer
>308 -- Early Mesozoic basin aquifers
>309 -- New York sandstone aquifers
>310 -- Pennsylvanian aquifers
>311 -- Marshall aquifer
>312 -- Cambrian-Ordovician aquifer system
>313 -- Jacobsville aquifer
>314 -- Lower Tertiary aquifers
>315 -- Upper Cretaceous aquifers
>316 –- Wyoming Tertiary aquifers
>401 -- Basin and Range carbonate-rock aquifers
>402 -- Roswell Basin aquifer system
>405 -- Ozark Plateaus aquifer system
>406 -- Blaine aquifer
>407 -- Arbuckle-Simpson aquifer
>410 -- Silurian-Devonian aquifers
>411 -- Ordovician aquifers
>412 -- Upper carbonate aquifer
>413 -- Floridan aquifer system
>414 -- Biscayne aquifer
>416 -- New York and New England carbonate-rock aquifers
>417 -- Piedmont and Blue Ridge carbonate-rock aquifers
>418 -- Castle Hayne aquifer
>419 –- Puerto Rico North Coast Limestone aquifer system
>420 -– Kingshill aquifer
>501 -- Edwards-Trinity aquifer system
>502 -- Valley and Ridge aquifers
>503 -- Mississippian aquifers
>504 -- Paleozoic aquifers
>505 -- Valley and Ridge carbonate-rock aquifers
>601 -- Southern Nevada volcanic-rock aquifers
>606 -- Snake River Plain basaltic-rock aquifers
>607 -- Columbia Plateau basaltic-rock aquifers
>608 -- Hawaiian Volcanic-rock aquifers
>609 –- Hawaiian Sedimentary deposit aquifers
>610 -– Pacific Northwest basaltic-rock aquifers
>611 -– Piedmont and Blue Ridge crystalline-rock aquifers
>999 –- Other rocks.  Rocks that are generally poorly permeable but
>         locally may contain productive aquifers.
Enumerated_Domain_Value_Definition_Source:
U.S. Geological Survey
Attribute:
Attribute_Label: Aq_code
Attribute_Definition:
The code number relating to the aquifer unit name.  There should be a
direct correlation between the values of the Rock_type and Rock_name
attributes, and between the Aq_name and Aq_code attributes.  See table
above under Aq_name.
Attribute_Definition_Source:
U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 101
Range_Domain_Maximum: 999
Attribute:
Attribute_Label: Shape.area
Attribute:
Attribute_Label: Shape.len
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Water Resources Division
Contact_Address:
Address_Type: Mailing address
Address:
12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-800-426-9000
Resource_Description: Downloadable Data
Distribution_Liability:
Although these data have been processed successfully on a computer system at
the U.S. Geological Survey, no warranty expressed or implied is made by the
U.S. Geological Survey regarding the utility of the data on any other
system, nor shall the act of distribution constitute any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI Personal Geodatabase
Transfer_Size: 0.467
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html>
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI Shapefile
Transfer_Size: 0.467
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html>
Digital_Form:
Digital_Transfer_Information:
Format_Name: SDTS
Transfer_Size: 0.467
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html>
Fees: There is no charge for the map layer.
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Metadata_Reference_Information:
Metadata_Date: 20050426
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Chief, Cartographic and Publications Program, Water Resources Division
Contact_Address:
Address_Type: Mailing and physical address
Address:
505 Science Drive
City: Madison
State_or_Province: WI
Postal_Code: 53711
Country: USA
Contact_Voice_Telephone: 608-238-9333
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description:
None
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
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