undet. Bivalvia

Geological context: Late Cretaceous, Fox Hills Fm, Trail City Mbr. Collection locality: big Gervillia concs., section A, unit 4, lot 2, exposure at toe at W end of spur, on E side of E tributary of Little Oak Creek, and 4 mi SSW of Little Eagle, Corson County, South Dakota, USA. Collected by Karl M. Waage, 1959. IP number 905162; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.905162,IP.905172,IP.905173,IP.905174,IP.905175,IP.905177,IP.905178,IP.905179,IP.905183,IP.905193,IP.905195,IP.905196,IP.905197,IP.905199,IP.905186,IP.905187,IP.905188,IP.905189,IP.905163,IP.905164,IP.905165,IP.905166,IP.905167,IP.905168,IP.905169,IP.905170,IP.905171,IP.905176,IP.905180,IP.905181,IP.905182,IP.905184,IP.905185,IP.905190,IP.905191,IP.905192,IP.905194,IP.905198.