Affiliation: | 1. Department of Geology, University of Kansas, , Lawrence, KS, 66045 USA;2. Department of Ecology & Evolutionary Biology and Biodiversity Institute, University of Kansas, , Lawrence, KS, 66045 USA;3. Department of Geology, San José State University, , San José, CA, 95192 USA;4. Paleontological Research Institution, , Ithaca, NY, 14850 USA |