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 312317; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.312317,IP.312321,IP.312322,IP.312323,IP.312324,IP.312325,IP.312326,IP.312327,IP.312328,IP.312329,IP.312330,IP.312331,IP.312318,IP.312319,IP.312320,IP.312339,IP.312332,IP.312333,IP.312334,IP.312335,IP.312336,IP.312337,IP.312338,IP.312340,IP.312341,IP.312342,IP.312343,IP.312344,IP.312345,IP.312346,IP.312347,IP.312348,IP.312349,IP.312350.