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Area where the Arikaree aquifer is absent, Pine Ridge Indian Reservation and Bennett County, South Dakota

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: June 09, 2026 at 11:48 PM | Dataset Last Updated: November 17, 2020 at 12:00 AM
This data set describes the area within the Pine Ridge Indian Reservation where the Arikaree aquifer (Arikaree Formation) is absent. This absent area includes areas where the Arikaree Formation has been eroded and where outcrops of geologic units older than the Arikaree Formation are present at the land surface.

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