Osage Springs Member of Lithograph City Formation of Cedar Valley Group (IA,MN)
late Middle to early Late Devonian (Givetian to Frasnian)
Roadcut along County Road T38, in SE/4 SE/4 SE/4 sec. 35, T. 98 N., R. 17 W., 3.9 km downstream from Osage Springs County Park, Mitchell Co., IA (Bunker and others, 1986; Witzke and others, 1988).
Iowa shelf
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