Macroconch

YPM 23129, right side

Late Cretaceous, Maastrichtian, Fox Hills Fm, Trail City Mbr, Little Eagle Lithofacies, Protocardia-Oxytoma Assemblage Zone. Concretions, E-facing bluff of sharp ridge on W bank of Grand River at E-W part of bend, 2.5 mi S of Bullhead, Miscol NE Quad., CENTER NW Sec6T20NR25E, Corson Co., South Dakota, USA. Collector: Waage, K.M., 1957.

Left side