Baculites compressus from the Campanian Pierre Shale Fm. of Wallace County, Kansas (KUMIP 59662). Baculites compressus from the Pierre Shale Fm. of Meade County, South Dakota (FHSMIP 1302). Baculites compressus from the Campanian Pierre Shale Fm. of Custer County, South Dakota (AMNH 58558). Baculites compressus from the Late Cretaceous Pierre Shale Fm. of South Dakota (UNM 9204). Baculites compressus from the Late Cretaceous Pierre Shale Fm. of Pennington County, South Dakota (UNM 2041).