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Midway Confining Unit: Alabama, Arkansas, Illinois, Kentucky, Missouri, Mississippi 2006-2008

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: January 27, 2026 | Last Modified: 2020-11-17T00:00:00Z
Digital hydrogeologic surface of the Midway Confining Unit in Alabama, Arkansas, Illinois, Kentucky, Missouri, Mississippi. The hydrogeologic unit dataset contains 414 rows and 394 columns representing 1-mile grid spacing. In general, limitations of data interpolation included areas of sparse geophysical log control points, log datums not clearly defined for some logs, unknown exact extent of each hydrogeologic unit in subcrop, interpolation limitations, and values averaged over 1-mile grid spacing.

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