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.

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.

Wyoming Tertiary aquifers

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

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.

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.

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.

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.

Denver Basin aquifer system

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This data set represents the extent of the Denver Basin aquifer system in Colorado.

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..