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..

Upper Cretaceous aquifers

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

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.

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.

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.

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.

Central Oklahoma aquifer

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

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.

Cambrian-Ordovician aquifer system

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This data set represents the extent of the Cambrian-Ordovician aquifer system in the states of Wisconsin, Michigan, Minnesota, Iowa, and Illinois.

Jacobsville aquifer

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This data set represents the extent of the Jacobsville aquifer in Michigan.