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: Rancho la Brea tar pits, Los Angeles, California The Rancholabrean NALMA is represented by several thousand individual vertebrate fossil sites distributed from Alaska to Central America. There
From sediments filling caves and sinkholes. 3.