Overview of central Mexican prehistory: morphostratigraphy, chronostratigraphy, biostratigraphy.
New research indicates an ice-free corridor may have been open for 20,000 years in North America and people could have moved southward even at Last Glacial Maximum. Morphostratigraphic, chronostratigraphic, biostratigraphic and archeological evidence from Central Mexico at Valsequillo, Texcoco/Tequixquiac and Chapala supports this view.
Pichardo
Mario
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D000818:Animals; D000884:Anthropology, Cultural; D000885:Anthropology, Physical; D002980:Climate; D004641:Emigration and Immigration / Q000266:history*; D005843:Geography / Q000266:history*; D049690:History, Ancient; D006801:Humans; D007198:Indians, North American / Q000266:history*; D007802:Language; D008800:Mexico; D010164:Paleopathology