"Vertebrate Biostratigraphy of the Smoky Hill Chalk (Niobrara Formation) and the SharonSprings Member (Pierre Shale)." High-Resolution Approaches in Stratigraphic
Vertebrate Biostratigraphy of the Smoky Hill Chalk (Niobrara Formation) and the SharonSprings Member (Pierre Shale). Harries, P. J. (编). High-resolution