Baculites 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 598649; lot count 1; taphonomy=concretion; accn=IPA.07133; associatedwith=on same slab: IP.598649,IP.598664,IP.598676,IP.598650,IP.598651,IP.598652,IP.598653,IP.598654,IP.598655,IP.598656,IP.598657,IP.598658,IP.598659,IP.598660,IP.598661,IP.598662,IP.598663,IP.598665,IP.598666,IP.598667,IP.598668,IP.598669,IP.598670,IP.598671,IP.598672,IP.598673,IP.598674,IP.598675,IP.598677,IP.598678,IP.598679,IP.598680,IP.598681,IP.598682,IP.598683,IP.598684.
Yale Peabody Museum’s own description