Revisions to Roland Brown’s North American Paleocene flora

Taxonomic and systematic revisions to the North American Nimravidae (Mammalia, Carnivora).

The Nimravidae is a family of extinct carnivores commonly referred to as "false saber-tooth cats." Since their initial discovery, they have prompted difficulty in taxonomic assignments and number of valid species. Past revisions have only examined a handful of genera, while recent advances in cladistic and morphometric analyses have granted us additional avenues to answering questions regarding...

The fossil record of North American mammals: evidence for a Paleocene evolutionary radiation.

Paleontologists long have argued that the most important evolutionary radiation of mammals occurred during the early Cenozoic, if not that all eutherians originated from a single common post-Cretaceous ancestor. Nonetheless, several recent molecular analyses claim to show that because several interordinal splits occurred during the Cretaceous, a major therian radiation was then underway. This c...

The oldest North American primate and mammalian biogeography during the Paleocene-Eocene Thermal Maximum.

Undoubted primates first appear almost synchronously in the fossil records of Asia, Europe, and North America. This temporal pattern has complicated efforts to reconstruct the early dispersal history of primates in relation to global climate change and eustatic fluctuations in sea level. Here, I describe fossils from the Tuscahoma Formation on the Gulf Coastal Plain of Mississippi documenting a...

Susiea newsalemae gen. et sp. nov. (Nymphaeaceae): Euryale ‐like Seeds from the Late Paleocene Almont Flora, North Dakota, U.S.A

The role of exotic species in homogenizing the North American flora.

Exotic species have begun to homogenize the global biota, yet few data are available to assess the extent of this process or factors that constrain its advance at global or continental scales. We evaluate homogenization of vascular plants across America north of Mexico by comparing similarity in the complete native and exotic floras between states and provinces of the USA and Canada. Compared w...