| Abstrakt: |
The genus Bison is one of the most common herbivorous mammals in the Late Pleistocene faunas of North America. It is also widely present throughout Mexico; however, published information on the bison species recorded in this country is very limited. We regard five species of Bison as valid in the Mexican Quaternary: B. alaskensis, B. priscus, B. latifrons, B. antiquus, and B. bison; also, given its biochronologic utility, we consider that B. antiquus is represented by two different chronomorphs with two different recognizable morphologies: a mainly Pleistocene "antiquus" morphology and a Holocene "occidentalis" morphology, both are part of the same species. Paleontological work carried out in the Mixteca Alta region of Oaxaca, Mexico, allowed the collection of additional cranial and postcranial specimens of Bison. Two different species were identified, B. antiquus and Bison cf. B. latifrons. Both species had a very wide geographic distribution in North America, with their records from Oaxaca as the most southern. Their combined records in the Mixteca Alta region allows to constrain the age of the Oaxacan localities to a range of 210–4.8 ka, most of them belonging to the Rancholabrean land mammal age. [ABSTRACT FROM AUTHOR] |
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