Spar Mountain Sandstone Member of Ste. Genevieve Limestone (IL)
Middle Mississippian (Visean; early Chesterian)
Named from exposures on south slope of Spar Mountain, about 4 mi northwest of town of Cave in Rock, in secs. 3 and 4, T. 12 S., R. 9 E., Hardin Co., IL (Tippie, 1945).
Illinois basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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