Geology and hydrology of the Dakota formation in South Dakota

Journal Article · Fri Jan 01 04:00:00 EST 1971 · Rep. Invest. - S.D., Geol. Surv.; (United States)

OSTI ID:5926919

Schoon, R A

A better understanding of the Cretaceous stratigraphy is obtained if the term Dakota is employed as used by Meek and Hayden in the type area. In this manner, the entire 400-ft section of sediments in the type area in NE. Nebraska is included in the Dakota Formation. The Dakota thins westward and is represented in the Black Hills by the newcastel tongues at the base and sporadic outcrops of the Mowry sands at the top; it includes no part of older sandstone bodies. The Inyan Kara Group which resembles the Dakota Formation and crops out in the Black Hills, is not represented either at the surface or in the subsurface at the type area of the Dakota. It is believed that the Inyan Kara Group and the Dakota Formation are separate stratigraphic and hydrologic units with distinctive water characteristics and hydraulic pressures. There are 3 distinct water types in the Dakota Formation-- sodium chloride in the W. half of the state, sodium sulfate in the E. part of the state, and a smaller area of calcium-sulfate type water in the SE. quarter of the state. The sodium-chloride water in the Dakota Formation of W. South Dakota is connate. In E. South Dakota where the Dakota yields a sodium-sulfate type water, the formation is recharged by the Roundtop-Inyan Kara interval. (63 refs.)

• OSTI ID: 5926919
• Journal Information: Rep. Invest. - S.D., Geol. Surv.; (United States), Journal Name: Rep. Invest. - S.D., Geol. Surv.; (United States) Vol. 104; ISSN SDGRA
• Country of Publication: United States
• Language: English

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