D. S. Jennings, B. F. Platt, and S. T. Hasiotis. 2006. Distribution of vertebrate trace fossils, Upper Jurassic Morrison Formation, Bighorn Basin, Wyoming, USA: implications for differentiating paleoecological and preservational bias. In J. R. Foster & S. G. Lucas (ed.), Paleontology and Geology of the Upper Jurassic Morrison Formation. New Mexico Museum of Natural History and Science Bulletin 36:183-192 [M. Carrano/M. Carrano]