I am interested in burrowing rodents and Arikareean faunas of Montana. As a consequence, I have worked on the palaeocastorine fauna (burrowing beavers) from the Fort Logan Formation (Montana). This fauna includes at least three different taxa. My work has focused on one of these: Palaeocastor peninsulatus. This animal was previously known only from Oregon. The material available from the Fort Logan Formation of Montana includes a juvenile, a sub-adult and an adult. These fossils curated at the University of Washington Burke Museum of Natural History include numerous elements of the post-cranial skeleton giving us an insight into the development of P. peninsulatus, its morphology and paleoecology.
Calede, J. 2014. Skeletal morphology of Palaeocastor peninsulatus (Rodentia, Castoridae) from the Fort Logan Formation of Montana (Early Arikareean): ontogenetic and paleoecological interpretations. Journal of Mammalian Evolution 21: 223-241. http://dx.doi.org/10.1007/s10914-013-9231-8
- Morphology and Ontogeny of Alphagaulus pristinus (jonathancalede.wordpress.com)