Peanut Peak Member of Chadron Formation of White River Group (SD)
Tertiary
Oligocene, early
At standard section of Chadron Formation in Big Badlands on south fork of Indian Creek, Pennington Co., SD (Williston basin), from sec. 34, T. 3 S., R. 12 E., to sec. 10, T. 4 S., R. 12 E. Named from prominent butte in southern part of sec. 10, T. 4 S., R. 12 E., locally known as Peanut Peak. [Same butte also called Crazy Johnson, the name given to the underlying Crazy Johnson member of Chadron.] (Clark, 1954).
Williston basin
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