undet. Ammonoidea
From the collection of Yale Peabody Museum. Free to download, adapt and use — no permission needed.
Geological context: Late Cretaceous, Fox Hills Fm, Timber Lake Mbr. Collection locality: float, conc., from CAZ at top of face, SW-facing exposures on ridge extending NW from bluffs on Timber Lake Mbr, and about .5 mi W of loc C0089, and 2.5 mi WSW of Green Grass, Dewey County, South Dakota, USA. Collected by Karl M. Waage, Ian G. Speden, 1962. IP number 907619; lot count 1; accn=IPA.07048; associatedwith=on same slab: IP.907619,IP.907630,IP.907627,IP.907640,IP.907624,IP.907641,IP.907622,IP.907625,IP.907639,IP.907628,IP.907629,IP.907626,IP.907621,IP.907623,IP.907637,IP.907636,IP.907642,IP.907632,IP.907635,IP.907620,IP.907638,IP.907631,IP.907634,IP.907633,IP.907643.
Yale Peabody Museum’s own description