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 440500; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.440500,IP.794618,IP.794619,IP.794622,IP.794637,IP.794638,IP.794613,IP.794620,IP.794623,IP.794624,IP.794625,IP.794626,IP.794629,IP.794630,IP.794631,IP.794636,IP.440501,IP.440502,IP.440503,IP.440504,IP.440505,IP.440506,IP.440507,IP.794614,IP.794615,IP.794621,IP.794627,IP.794628,IP.794632,IP.794633,IP.794634,IP.794635,IP.794616,IP.794617.