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 312646; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.312646,IP.312662,IP.312663,IP.312666,IP.312647,IP.312648,IP.312649,IP.312650,IP.312655,IP.312656,IP.312664,IP.312665,IP.312667,IP.312651,IP.312652,IP.312653,IP.312654,IP.312657,IP.312658,IP.312659,IP.312660,IP.312661.