Hemphillian North American Land Mammal Age – Florida Vertebrate Fossils https://www.floridamuseum.ufl.edu/florida-vertebrate-fossils/land-mammal-ages/hemphillian/
Defining taxon: first appearance of the ground sloth Pliometanastes (Tedford et al., 2004) Basis of name: Wood et al. (1941) based the name on what they termed the “Hemphill member of the Ogallala [Formation].” This stratigraphic unit was originally named the “Hemphill Beds” by Reed and Longnecke
the late Neogene dwarf tapir, Tapirus polkensis (Olsen