Protocardia subquadrata

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 440463; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.440463,IP.440464,IP.440465,IP.440466,IP.440467,IP.440468,IP.440469,IP.440470,IP.440472,IP.440473,IP.440474,IP.440475,IP.440476,IP.440477,IP.440478,IP.440479,IP.440480,IP.440481,IP.440482,IP.440483,IP.440484,IP.440485,IP.440487,IP.440488,IP.440489,IP.440490,IP.440491,IP.440492,IP.440493,IP.440494,IP.440495,IP.440496,IP.440497,IP.440498,IP.440499,IP.440471,IP.440486.