undet. Scaphitidae
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm, Trail City Mbr. Collection locality: float, concs. in river bed, undifferentiated Limopsis - large Gervillia layers, high bluff on N bank of Grand River, about .5 mi W of Bullhead, Corson County, South Dakota, USA. Collected by Karl M. Waage, 1956/1959. IP number 902812; lot count 1; accn=IPA.07111; associatedwith=on same slab: IP.902812,IP.902832,IP.902833,IP.902834,IP.902835,IP.902836,IP.902830,IP.902831,IP.902837,IP.902838,IP.902839,IP.902840,IP.902841,IP.902842,IP.902843,IP.902844,IP.902845,IP.902846,IP.902847,IP.902848,IP.902849,IP.902813,IP.902814,IP.902815,IP.902816,IP.902817,IP.902818,IP.902819,IP.902820,IP.902821,IP.902822,IP.902823,IP.902824,IP.902825,IP.902826,IP.902827,IP.902828,IP.902829.
Yale Peabody Museum’s own description