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.

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.

Miocene basaltic-rock aquifers

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This data set represents the extent of the Miocene basaltic-rock aquifers in the states of Idaho, Oregon, Washington, California, and Nevada.

Arbuckle-Simpson aquifer

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

Central Oklahoma aquifer

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This data set represents the extent of the Central Oklahoma aquifer in Oklahoma.

Texas coastal uplands aquifer system

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This data set represents the extent of the Texas coastal uplands aquifer system in Texas.

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..

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.

Blaine aquifer

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This data set represents the extent of the Blaine aquifer in Texas and Oklahoma.

Basin and Range carbonate-rock aquifers

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This data set represents the extent of the Basin and Range carbonate-rock aquifers in the states of Idaho, Utah, Arizona, Nevada, and California.