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 440279; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.440279,IP.440295,IP.440296,IP.440283,IP.440280,IP.440284,IP.440285,IP.440290,IP.440309,IP.440310,IP.440313,IP.440281,IP.440282,IP.440286,IP.440287,IP.440288,IP.440289,IP.440291,IP.440292,IP.440293,IP.440294,IP.440297,IP.440298,IP.440299,IP.440307,IP.440308,IP.440311,IP.440314,IP.440315,IP.440316,IP.440300,IP.440301,IP.440302,IP.440303,IP.440304,IP.440305,IP.440306,IP.440312,IP.440317.