undet. Bivalvia

Geological context: Late Cretaceous, Carlile Sh, Turner Sandy Mbr. Collection locality: rusty weathered concretionary ledge the top of which is 110.5 feet above base of Turner, 2 mi W of US Rt 85, & 8 mi NNW of Belle Fourche, Butte County, South Dakota, USA. Collected by Karl M. Waage, Neil H. Landman, 1977. IP number 615583; lot count 1; taphonomy=concretion; accn=IPA.07111; associatedwith=on same slab: IP.615583,IP.615596,IP.615597,IP.615598,IP.615599,IP.615600,IP.615601,IP.615602,IP.615603,IP.615604,IP.615605,IP.615606,IP.615607,IP.615608,IP.615609,IP.615584,IP.615585,IP.615586,IP.615587,IP.615588,IP.615589,IP.615590,IP.615591,IP.615592,IP.615593,IP.615594,IP.615595.