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
Natural History Museum of Los Angeles County Science Series, Number 41.
