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Giant Mammoth Skull Discovered by Bulldozer Operator
https://www.yahoo.com/news/giant-mammoth-skull-discovered-bulldozer-operator-134212502.html
The skull belonged to a Columbian mammoth.
https://en.wikipedia.org/wiki/Columbian_mammoth
http://www.ucmp.berkeley.edu/mammal/mammoth/about_mammoths.html
http://library.sandiegozoo.org/factsheets/_extinct/mammoth/mammoth.htm
http://earthwatch.org/expeditions/mammoth-graveyard-in-south-dakota
https://www.yahoo.com/news/giant-mammoth-skull-discovered-bulldozer-operator-134212502.html
The skull belonged to a Columbian mammoth.
Apparently there are a few findings of mammoth fossils every year.These giants were plentiful across the plains of Oklahoma during the Pleistocene epoch, which lasted from about 1.8 million to 11,700 years ago, said Leland Bement of the Oklahoma Archaeological Survey.
Like other Columbian mammoths (Mammuthus columbi), this one was not the cold-adapted type and preferred more temperate stomping grounds in southern and central North America. The woolly mammoth (Mammuthus primigenius), the kind portrayed in the "Ice Age" movies, would have called the chilly tundra home.
The Columbian variety was also much larger than the woollies, with Columbian males reaching up to twice the size of woolly males, according to Hendrik Poinar, an evolutionary geneticist at McMaster University in Hamilton, Canada. Columbian mammoths also arrived in North America about 1.5 million years ago, whereas woolly mammoths stepped onto the continent some 400,000 years ago, said Poinar, who spoke with Live Science in 2011.
https://en.wikipedia.org/wiki/Columbian_mammoth
http://www.ucmp.berkeley.edu/mammal/mammoth/about_mammoths.html
http://library.sandiegozoo.org/factsheets/_extinct/mammoth/mammoth.htm
http://earthwatch.org/expeditions/mammoth-graveyard-in-south-dakota