Hoploscaphites sp.
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Pierre Sh, Kara Bentonitic Mbr. Collection locality: conc horizon, top of Kara Bentonite, in Brewster Draw downstream from (ie stratigraphically higher than) loc. B1170, & 2.4 mi NE of Redbird, Niobrara County, Wyoming, USA. Collected by Karl M. Waage, Neil H. Landman, Ellen M. Wright, John Kurtz, 1983-07-19. IP number 598832; lot count 1; taphonomy=concretion; accn=IPA.07133; associatedwith=on same slab: IP.598832,IP.598833,IP.598834,IP.598836,IP.598837,IP.598838,IP.598839,IP.598846,IP.598847,IP.598848,IP.598849,IP.598855,IP.598856,IP.598861,IP.598862,IP.598835,IP.598840,IP.598841,IP.598842,IP.598843,IP.598844,IP.598845,IP.598850,IP.598851,IP.598852,IP.598853,IP.598854,IP.598857,IP.598858,IP.598859,IP.598860,IP.598863,IP.598864.
Yale Peabody Museum’s own description