Chickasaw Shale Member of Little Cedar Formation of Cedar Valley Group (IA)
late Middle Devonian (Givetian)
Type section: Chickasaw Park, in N/2 NW/4 NE/4 sec. 21, T. 95 N., R. 14 W., Chickasaw Co., IA (Witzke and others, 1988).
Iowa shelf
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