Hoploscaphites sp.
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: conc., road cut on E side of McLaughlin-Little Eagle road through first hill N of and about 2.8 mi N of Little Eagle, Corson County, South Dakota, USA. Collected by Jeremy Reiskind, Peter Scholle, Jonathan K. Waage, 1964. IP number 900630; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.900630,IP.900646,IP.900647,IP.900649,IP.900631,IP.900636,IP.900642,IP.900650,IP.900651,IP.900652,IP.900653,IP.900654,IP.900655,IP.900656,IP.900657,IP.900658,IP.900659,IP.900660,IP.900661,IP.900662,IP.900663,IP.900664,IP.900665,IP.900666,IP.900667,IP.900668,IP.900669,IP.900670,IP.900671,IP.900672,IP.900673,IP.900674,IP.900675,IP.900676,IP.900677,IP.900678,IP.900679,IP.900680,IP.900681,IP.900682,IP.900683,IP.900684,IP.900685,IP.900686,IP.900687,IP.900688,IP.900689,IP.900690,IP.900691,IP.900692.
Yale Peabody Museum’s own description