undet. Bivalvia

Geological context: Late Cretaceous, Fox Hills Fm, Timber Lake Mbr. Collection locality: float and in place, includes many concs., from Sphenodiscus Layer up through CAZ, road cut and adjacent outcrops along W side of SD Rt. 63, from High Elk Hill to point .5 mi N, & between 5.5 and 6 mi S of intersection with US Rt. 212, High Elk Hill, 6 mi SSW of Eagle Butte village, Ziebach County, South Dakota, USA. Collected by Karl M. Waage, 1940/1941. IP number 794515; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.794515,IP.795139,IP.795141,IP.795142,IP.795143,IP.795144,IP.795145,IP.795146,IP.795147,IP.795148,IP.795149,IP.795150,IP.795152,IP.795153,IP.795154,IP.795155,IP.795156,IP.795157,IP.795158,IP.795159,IP.795160,IP.795161,IP.795140,IP.795151.