Rancholabrean North American Land Mammal Age – Florida Vertebrate Fossils https://www.floridamuseum.ufl.edu/florida-vertebrate-fossils/land-mammal-ages/rancholabrean/
Defining taxon: first appearance of Bison south of 55° N latitude (Bell et al., 2004) Basis of name:
The presence of Bison at a Florida fossil site is a clear indicator of a Rancholabrean age.