Lower Tertiary aquifers

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This data set represents the extent of the Lower Tertiary aquifers in the states of North Dakota, South Dakota, Wyoming, and Montana.

Paleozoic aquifers

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This data set represents the extent of the Paleozoic aquifers in the states of South Dakota, Wyoming, and Montana.

Lower Cretaceous aquifers

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This data set represents the extent of the Lower Cretaceous aquifers in the states of Montana, Wyoming, South Dakota, Kansas, Nebraska, Iowa, and Minnesota..

Wyoming Tertiary aquifers

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This data set represents the extent of the Wyoming Tertiary aquifers in Wyoming.

High Plains aquifer (SUPERCEDED)

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This data set represents the extent of the High Plains aquifer in the states of South Dakota, Wyoming, Nebraska, Colorado, Kansas, New Mexico, Oklahoma, and Texas. This aquifer extent has been superceded by DS543 https://water.usgs.gov/GIS/metadata/usgswrd/XML/ds543.xml

Northern Rocky Mountains Intermontane Basins aquifer system

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This data set represents the extent of the Northern Rocky Mountains Intermontane Basins aquifer system in Montana and Idaho.

Volcanic and sedimentary-rock aquifers

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This data set represents the extent of the Volcanic and sedimentary-rock aquifers in the states of Montana, Wyoming, Idaho, Nevada, California, Oregon, and Washington.

Arbuckle-Simpson aquifer

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This data set represents the extent of the Arbuckle-Simpson aquifer in Oklahoma.

Mississippian aquifers

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This data set represents the extent of the Mississippian aquifers which is in the uppermost aquifer in Paleozoic rocks of northern Missouri.

Base of aquifer contours for the Northern High Plains aquifer

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Several pre-existing datasets that characterize portions of the Northern High Plains aquifer base were merged together in order to define the entire base of the Northern High Plains aquifer. This digital dataset consists of the aquifer base elevation contours (100-foot contour interval) for the northern portion of the High Plains aquifer in the central United States. The boundaries were chosen to simplify boundary conditions for a computer simulation model being used for a hydrologic study of the Northern High Plains.