Columbian Mammoth and Bison rock engravings have been found at the Upper Sand Island rock art site at the San Juan River in Utah, USA. The engravings appear authentic, and show rock varnish and wear indicating that they are from the end of the ice age, as well as anatomical details not commonly known to the public, and accompanying motifs in a similar previously unknown style. The rock engravings date to 13 000 - 11 000 years ago.
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