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Metadata for the Principal Aquifers dataset
Principal Aquifers: Map Layer Description File
This map layer shows the distribution of the principal aquifers that supply ground
water to the conterminous United States (commonly called the "lower 48 states").
The aquifer that is shown in each geographic area is generally the uppermost principal
aquifer for the area. Each principal aquifer is classified as one of six types of
permeable geologic material:
unconsolidated deposits of sand and gravel,
semiconsolidated sand,
sandstone,
carbonate rocks,
interbedded sandstone and carbonate rocks, and
basalt and other types of volcanic rock.
Glacial deposits that contain numerous productive aquifers, and major alluvial aquifers
along main watercourses are not shown.
The principal aquifers map layer was compiled by the U.S. Geological Survey.
Other Sources of Information About Aquifers
The USGS Office of Ground Water
provides information about the ground-water resources of the Nation and ground-water
activities of the USGS.
The Ground Water Atlas
of the United States describes the location, the extent, and the geologic and
hydrologic characteristics of the important aquifers of the Nation.
USGS Water Science for Schools
offers information on many aspects of water, along with pictures, data, maps, and an
interactive center where you can give opinions and test your water knowledge.
Metadata
What follows is very detailed technical information about this map layer. This is often
called metadata. Metadata (or "data about data") describe the content, quality,
condition, and other characteristics of data. Metadata are used to organize and maintain
investments in data, to provide information to data catalogs and clearinghouses, and to
aid data transfers. The Federal Geographic Data Committee
(FGDC) publishes the Content Standard
for Digital Geospatial Metadata. Many organizations within and outside of the federal
government have adopted the FGDC metadata standard and are using automated indexing and
serving mechanisms to provide access to their holdings through the Internet. Visit the FGDC Clearinghouse to
learn more about how metadata is used in clearinghouses and to search for other data sets.
- Identification_Information:
- Citation:
- Citation_Information:
- Originator: James A. Miller (comp.)
- Publication_Date: 19980701
- Title:
- Principal Aquifers of the 48 Contiguous United States
- Edition: Version 1.0
- Geospatial_Data_Presentation_Form: map
- Publication_Information:
- Publication_Place: Madison, Wisconsin, USA
- Publisher: U.S. Geological Survey
- Description:
- Abstract:
- This data set contains the shallowest principal aquifers of the contiguous United
States, portrayed as polygons. The data set 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
this data.
- 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 data set, such as maps of alluvial and
glacial aquifers that overlie the aquifers in this data set, as well as other information
described below.
The areal extent of the aquifers, as shown in this data set, represent
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 data set 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 data set. Major alluvial aquifers that
occur along main watercourses are not shown. Significant unconsolidated sand and gravel
aquifers, that are not indicated in this data set but are important sources of water, may
occur locally in glaciated regions. The user of this data set 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 data set 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 data set. 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, Roy Sonenshein,
sunshine@usgs.gov, (305) 717-5824.
This data set 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 data set 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
Refer to: <http://wwwcapp.er.usgs.gov/publicdocs/gwa/index.html>
for a graphic depiction of the GWA chapter regions, as well as more information about the
GWA.
Although these spatial data can stand alone, it may be helpful to refer to the printed
GWA chapters when using the data. There are three subject areas in which there are
significant differences between this data set and the printed chapters: category changes,
which are described below; coastline location, and the representation of aquifers in
Western Montana, both of which are discussed in the Process Description under Lineage.
Category Changes 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. In most cases, the name and
delineation of the aquifer is identical between this data set and the GWA printed maps,
but there are several areas of differences. In some cases, a single aquifer from a GWA
chapter is represented among multiple aquifers in this data set.
The following listings show the differences between aquifer names in the GWA chapters
and the aq_name and aq_code used in this data set. 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 system
Confining unit 999-Not a principal aquifer
Not a principal aquifer 999-Not a principal aquifer
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-Not a principal aquifer
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-Not a principal aquifer
Mississippi embayment 109-Mississippi River Valley
aquifer system alluvial aquifer
203-Mississippi embayment
aquifer
204-Southeastern Coastal
Plain aquifer system
999-Not a principal aquifer
MINOR AQUIFERS AND AQUIFER SYSTEMS - Aquifer systems in
rocks of cretaceous age
Edwards-Trinity aquifer 501-Edwards-Trinity aquifer
system (Trinity aquifer) system
Tokio-Woodbine aquifer 999-Not a principal aquifer
Ouachita Mountains aquifer 999-Not a principal aquifer
CONFINING SYSTEMS AND CONFINING UNITS
Western Interior Plains 999-Not a principal aquifer
confining systems
Confining unit 109-Mississippi River Valley
alluvial aquifer
203-Mississippi embayment
aquifer system
999-Not a principal aquifer
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 999-Not a principal aquifer
aquifers
Appalachian Plateaus 310-Pennsylvanian aquifers
aquifers
Interior Low Plateaus 503-Mississippian aquifers
aquifers
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-H
Name from fig 5, page H4 aq_code-aq_name
Unconsolidated-deposit 104-Pacific Northwest
aquifers basin-fill aquifers
112-Puget-Willamette Lowland
aquifer system
105-Northern Rocky Mountains
Intermontane basins
aquifer system
101-Basin and Range aquifers
Pliocene and younger 603-Pliocene and younger
basaltic-rock aquifers basaltic-rock aquifers
606-Snake River Plain
aquifer system
Miocene basaltic-rock 607-Columbia Plateau aquifer
aquifers system
604-Miocene basaltic-rock
aquifers
Aquifers in pre-Miocene 401-Basin and Range
rocks carbonate-rock aquifers
999-Not a principal aquifer
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 605-Volcanic and
sedimentary rock aquifers sedimentary-rock
aquifers
Upper Tertiary aquifers 107-High Plains aquifer
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 aquifer
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-Mississippian aquifers
of Michigan
Crystalline-rock aquifer 999-Not a principal aquifer
Confining unit 999-Not a principal aquifer
GWA chapter HA 730-K
Name from fig 5, page K4 aq_code-aq_name
Blue Ridge aquifers 308-Early Mesozoic basin
aquifers
999-Not a principal aquifer
MISSISSIPPI EMBAYMENT AQUIFER SYSTEM
Upper Claiborne, middle 203-Mississippi embayment
Claiborne, middle Wilcox, aquifer system
and lower Wilcox 109-Mississippi River Valley
alluvial aquifer
McNairy-Nacatoch 204-Southeastern Coastal
Plain aquifer system
Confining unit 999-Not a principal aquifer
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
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 999-Not a principal aquifer
Valley and Ridge 505-Valley and Ridge
carbonate-rock aquifers carbonate-rock aquifers
416-New York and New England
carbonate-rock aquifers
APPALACHIAN PLATEAUS
Permian and Pennsylvanian 310-Pennsylvanian aquifers
aquifers
GWA chapter HA 730-M
Name from fig 10, page M5 aq_code-aq_name
CARBONATE-ROCK AQUIFERS
New York and New England 416-New York and New England
carbonate-rock aquifers
Valley and Ridge 416-New York and New England
carbonate-rock aquifers
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-Not a principal aquifer
New England 999-Not a principal aquifer
Related Spatial and Tabular Data Sets A data set showing the extent of glacial deposits
is also available. This data set shows the southern limit of glaciation in the United
States; areas north of the limit line may contain significant sand and gravel glacial
deposits that are important sources of water for local areas.
A data set of aquifers of Alaska is also available.
A data set of aquifers of Puerto Rico and the U.S. Virgin Islands is also available.
A data set of aquifers of Hawaii is planned.
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: 19980701
- Currentness_Reference: publication date
- Status:
- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
- Bounding_Coordinates:
- West_Bounding_Coordinate: -124.7559077
- East_Bounding_Coordinate: -66.93956058
- North_Bounding_Coordinate: 49.38561903
- South_Bounding_Coordinate: 24.51832172
- Keywords:
- 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: 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: 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 Publishing 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 data set was created and modified over a period of at least five years by several
staff members of the U.S. Geological Survey Water Resources Division Cartographic and
Publications Program in Madison, Wisconsin. Completion of this data set 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:
- Data General UNIX, ARC/INFO Version 7.04 coverage; and ESRI Shapefile format
- 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 data set includes aquifer information for the 48 contiguous United States.
- Lineage:
- Source_Information:
- Source_Citation:
- Citation_Information:
- Originator: Planert, M. and 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. and 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. and 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., and 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. and 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: United States Geological Survey
- Publication_Date: 1998
- Title: State Boundaries
- Geospatial_Data_Presentation_Form: map
- Publication_Information:
- Publication_Place: Reston,VA
- Publisher: U.S. Geological Survey
- Online_Linkage:
- <http://edcftp.cr.usgs.gov/pub/data>
/nationalatlas/statesp020.tar.gz
- Source_Scale_Denominator: 2000000
- Type_of_Source_Media: online
- Source_Time_Period_of_Content:
- Time_Period_Information:
- Single_Date/Time:
- Calendar_Date: 1997
- Source_Currentness_Reference: publication date
- Source_Citation_Abbreviation: DLG State boundaries
- Source_Contribution: Coastline and international boundary
- 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 contiguous 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 Division 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
- Source_Produced_Citation_Abbreviation:
- National aquifers file
- Process_Date: 1993
- 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 U.S. Geological Survey National Mapping
Division was used to provide the coastline and two aquifer boundaries that coincide with
State lines. A publicly available version of this data and its metadata (Map Layer Theme:
States) can be found at: <http://www-atlas.usgs.gov/atlasftp.html>
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 data set 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 data set.
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: DLG State boundaries
- Process_Date: 1997
- Spatial_Data_Organization_Information:
- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: Area point
- Point_and_Vector_Object_Count: 4276
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type: Complete chain
- Point_and_Vector_Object_Count: 6802
- SDTS_Terms_Description:
- SDTS_Point_and_Vector_Object_Type:
- GT-polygon composed of chains
- Point_and_Vector_Object_Count: 4276
- Spatial_Reference_Information:
- Horizontal_Coordinate_System_Definition:
- Geographic:
- Latitude_Resolution: 0.000278
- Longitude_Resolution: 0.000278
- Geographic_Coordinate_Units: Decimal degrees
- Geodetic_Model:
- Horizontal_Datum_Name: North American Datum of 1983
- Ellipsoid_Name: GRS1980
- Semi-major_Axis: 6378137.0
- Denominator_of_Flattening_Ratio: 298.257222
- Entity_and_Attribute_Information:
- Detailed_Description:
- Entity_Type:
- Entity_Type_Label:
- Aquifer (described by aquifrp025.pat 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: 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
- Attribute:
- Attribute_Label: Area
- Attribute_Definition:
- The size of the shape in coverage units
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0.00000
- Range_Domain_Maximum: 56.31950
- Attribute:
- Attribute_Label: Perimeter
- Attribute_Definition:
- The perimeter of the shape in coverage units
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0.01024
- Range_Domain_Maximum: 606.75187
- Attribute:
- Attribute_Label: Aquifrp025# or Aquifrp025
- Attribute_Definition: Internal feature number
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 2
- Range_Domain_Maximum: 4277
- Attribute:
- Attribute_Label: Aquifrp025-ID or Aquifrp025
- Attribute_Definition: User-assigned feature number
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 4276
- 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:
- 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:
- semiconsolidated sand aquifers
- Enumerated_Domain_Value_Definition:
- Formations composed of partially solidified sand.
- 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: 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:
- 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:
- Basalt and other volcanic- 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: (blank field)
- Enumerated_Domain_Value_Definition:
- Not a principal aquifer
- 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: 0
- Enumerated_Domain_Value_Definition:
- Null value, assigned to null polygon
- Enumerated_Domain_Value_Definition_Source:
- U.S. Geological Survey
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 100
- Enumerated_Domain_Value_Definition:
- Number for 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:
- Number for 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:
- Number for sandstone aquifers
- Enumerated_Domain_Value_Definition_Source:
- U.S. Geological Survey
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 400
- Enumerated_Domain_Value_Definition:
- Number for 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:
- Number for 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:
- Number for basalt and other volcanic-rock aquifers
- Enumerated_Domain_Value_Definition_Source:
- U.S. Geological Survey
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 999
- Enumerated_Domain_Value_Definition:
- Not a principal aquifer
- 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:
- Unrepresentable_Domain:
- There is no predefined set of official aquifer names. The names used in this data set
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
0 -- null value, assigned to null polygon
101 -- Basin and Range 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-Willamette Lowland aquifer system
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 -- Mississippian aquifer of Michigan
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
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
602 -- Northern California volcanic-rock aquifers
603 -- Pliocene and younger basaltic-rock aquifers
604 -- Miocene basaltic-rock aquifers
605 -- Volcanic-and sedimentary-rock aquifers
606 -- Snake River Plain aquifer system
607 -- Columbia Plateau aquifer system
999 -- Not a principal aquifer (field left blank)
- 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.
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0
- Range_Domain_Maximum: 999
- Detailed_Description:
- Entity_Type:
- Entity_Type_Label:
- Aquifer boundaries and internal contacts (described by aquifrp.aat or aquifrl025.dbf)
- Entity_Type_Definition: The limits of the aquifers shown
- Entity_Type_Definition_Source: U.S. Geological Survey
- 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: Polyline
- Enumerated_Domain_Value_Definition:
- 1-dimensional element that surrounds a 2-dimensional element
- Enumerated_Domain_Value_Definition_Source:
- ESRI GIS software
- Attribute:
- Attribute_Label: FNODE# or Fnode_
- Attribute_Definition: Internal number of the from-node
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 5632
- Attribute:
- Attribute_Label: TNODE# or Tnode_
- Attribute_Definition: Internal number of the to-node
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 5632
- Attribute:
- Attribute_Label: LPOLY# or Lpoly_
- Attribute_Definition:
- Internal number of the polygon to the left of the arc
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 4277
- Attribute:
- Attribute_Label: RPOLY# or Rpoly_
- Attribute_Definition:
- Internal number of the polygon to the right of the arc
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 4267
- Attribute:
- Attribute_Label: Length
- Attribute_Definition:
- The length of the arc in coverage units.
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 0.00159
- Range_Domain_Maximum: 16.14569
- Attribute:
- Attribute_Label: Aquifrp025# or Aquifrp025
- Attribute_Definition: Internal feature number
- Attribute_Definition_Source: GIS Software
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 6802
- Attribute:
- Attribute_Label: Aquifrp025-ID or Aquifrp025
- Attribute_Definition: User-assigned feature number
- Attribute_Definition_Source: GIS Software
- Attribute_Domain_Values:
- Range_Domain:
- Range_Domain_Minimum: 1
- Range_Domain_Maximum: 6795
- Attribute:
- Attribute_Label: Lntype
- Attribute_Definition: The line category
- Attribute_Definition_Source: U.S. Geological Survey
- Attribute_Domain_Values:
- Enumerated_Domain:
- Enumerated_Domain_Value: 1
- Enumerated_Domain_Value_Definition:
- coastline or international boundary
- Enumerated_Domain_Value_Definition_Source:
- U.S. Geological Survey
- Enumerated_Domain:
- Enumerated_Domain_Value: 2
- Enumerated_Domain_Value_Definition:
- interior aquifer contact line
- Enumerated_Domain_Value_Definition_Source:
- U.S. Geological Survey
- 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
- 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.
- Metadata_Reference_Information:
- Metadata_Date: 19990330
- Metadata_Contact:
- Contact_Information:
- Contact_Organization_Primary:
- Contact_Organization: U.S. Geological Survey
- Contact_Person:
- Chief, Cartographic and Publishing 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_Security_Information:
- Metadata_Security_Classification_System: None
- Metadata_Security_Classification: Unclassified
- Metadata_Security_Handling_Description: None
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