Name: Principal Aquifers

Display Field: ROCK_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data set represents the extent of the alluvial and glacial aquifers north of the southern-most line of glaciation. Aquifers are shown in the States of Maine, Vermont, New Hampshire, Connecticut, Massachusetts, Rhode Island, New Jersey, New York, Pennsylvania, Ohio, Indiana, Michigan, Wisconsin, Illinois, Minnesota, Iowa, Missouri, Kansas, Nebraska, South Dakota, North Dakota, and Montana. These data delineate the areal extent of the alluvial and glacial aquifers as defined in The Ground Water Atlas of The United States.</SPAN></P><P><SPAN>This data set was constructed by combining data created for or from the regional Groundwater Atlas chapters. Minor aquifers that are important local sources of water were mapped in some regions, so the regional maps in the Groundwater Atlas 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. </SPAN></P><P><SPAN>See USGS metadata for description of rock type codes </SPAN><A href="https://water.usgs.gov:443/GIS/metadata/usgswrd/XML/aquifers_us.xml" STYLE="text-decoration:underline;"><SPAN>https://water.usgs.gov/GIS/metadata/usgswrd/XML/aquifers_us.xml</SPAN></A></P><P><SPAN>Downloaded from USGS on June 29, 2021 at https://water.usgs.gov/GIS/metadata/usgswrd/XML/aquifers_us.xml#stdorder</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>

Service Item Id: 62092ee4bc73463ca45d224d30846067

Copyright Text: U.S. Geological Survey

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Spatial Reference: 4269  (4269)

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• Value: Basin and Range basin-fill aquifers
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• Value: Basin and Range carbonate-rock aquifers
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• Value: California Coastal Basin aquifers
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• Value: Central Valley aquifer system
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• Value: Colorado Plateaus aquifers
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• Value: Columbia Plateau basaltic-rock aquifers
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• Value: Northern Rocky Mountains Intermontane Basins aquifer system
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• Value: Pacific Northwest basaltic-rock aquifers
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• Value: Rio Grande aquifer system
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• Value: Snake River Plain basaltic-rock aquifers
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• Value: Southern Nevada volcanic-rock aquifers
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• Value: Upper Tertiary aquifers
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• Value: Willamette Lowland basin-fill aquifers
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• ROCK_NAME ( type: esriFieldTypeString, alias: ROCK_NAME, length: 40 )
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