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Mastodon remains in California

เผยแพร่:   โดย: MGR Online

A handout image released on April 25, 2017 by the University of Michigan shows mastodon skeleton schematic showing which bones and teeth of the animal were found at the site of the search. AFP/University of Michigan/Dan Fisher and Adam Routrey
High-tech dating of mastodon remains found in southern California has shattered the timeline of human migration to America, pushing the presence of hominins back to 130,000 years ago rather than just 15,000 years, according to researchers.

Teeth and bones of the elephant-like creature unmistakably modified by human hands, along with stone hammers and anvils, leave no doubt that some species of early human feasted on its carcass, they reported in the journal Nature.
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows a close-up view of a spirally fractured mastodon femur bone. AFP/San Diego Natural History Museum/Tom Demere
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows layout depicting bone breakage experiment on a modern elephants leg bones in an attempt to determine the kinds of breakage patterns resulting from hammerstone percussion. AFP/San Diego Natural History Museum/Kate Johnson
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows a boulder discovered at the Cerutti Mastodon site thought to have been used by early humans as a hammerstone. AFP/San Diego Natural History Museum/Tom Demere
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows paleontologist Don Swanson pointing at rock fragment near a large horizontal mastodon tusk fragment. AFP/San Diego Natural History Museum/Stringer
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows a concentration of fossil bone and rock. Mastodon molars are located in the lower right hand corner next to a large rock comprised of andesite which is in contact with a broken vertebra. Upper left is a rib angled upwards resting on a granitic pegmatite rock fragment. AFP/San Diego Natural History Museum/Stringer
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows a view of two mastodon femur balls, one faced up and once faced down, neural spine of a vertebra exposed (lower right) and a broken rib (lower left). AFP/San Diego Natural History Museum/Stringer
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows Caltrans archaeologists Karen Crafts, Chris White, and Don Laylander excavating fossils found at the Cerutti Mastodon site off State Route 54 in San Diego. AFP/San Diego Natural History Museum/Stringer
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows the surface of mastodon bone showing half impact notch on a segment of femur. AFP/San Diego Natural History Museum/Tom Demere
A handout picture released on April 25, 2017 by the San Diego Natural History Museum shows an unbroken mastodon ribs and vertebrae, including one vertebra with a large well preserved neural spine found in excavation unit J4. AFP/San Diego Natural History Museum/Stringer
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