An ancient mastodon ignited a debate over humans' arrival in North America
December 26, 2017 by Thomas Curwen, Los Angeles Times
"Oh my God," Richard Cerutti said to himself. He bent down to pick up a sharp, splintered bone fragment. Its thickness and weight told him that it belonged to an animal, a very big animal. His mind started to race.
He was standing at the foot of a slope being groomed by the California Department of Transportation for a road-widening project through the Sweetwater Valley near National City.
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https://phys.org/news/2017-12-ancient-mastodon-ignited-debate-humans.html#jCp
