undet. Mollusca

Geological context: Late Cretaceous, Fox Hills Fm, Iron Lightning Mbr. Collection locality: 2 shell lenses 2 in thick, one 12.5 ft wide and the other, 8 in below, 8 ft wide, about 50 ft [100 ft per KMW] below Hell Creek [probably horizon top of 1st (lower) Colgate, or keybed per KMW], base of Iron Lightning badlands face, 3 mi S of Moreau River, and 4.1 mi SSE of Iron Lightning, Ziebach County, South Dakota, USA. Collected by Ian G. Speden, 1962. IP number 314274; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=IP.314275,IP.314276,IP.314277,IP.314278,IP.314279,IP.314280,IP.314281,IP.314282,IP.314283,IP.314284,IP.314285,IP.314286,IP.314287,IP.314288,IP.314289,IP.314290,IP.314291,IP.314292,IP.314293,IP.314294,IP.314295,IP.314296,IP.314297,IP.314298,IP.314299,IP.314300,IP.314301,IP.314302.