Start Relative dating methods in anthropology

Relative dating methods in anthropology

What we call Laurasia eventually became North America, Asia and Europe.

As with dromaeosaurs, new discoveries are forcing scientist to re-consider their earlier theories of Human presence in the American hemisphere as well.

The time of the first peopling of Mesoamerica remains a puzzle, as it does for that of the Americas in general.

By Gisela Crespo, CNN, April 26, 2017 The remains of a mastodon discovered during a routine excavation in California shows possible human activity in North America 130,000 years ago -- or about 115,000 years earlier than previously thought.

The study, to be published this week in the science journal Nature, said the numerous limb bones fragments of a young male mastodon found at the site show spiral fractures, indicating they were broken while fresh.

"Buitreraptor is one of those special fossils that tells a bigger story about the Earth's history and the timing of evolutionary events," said Peter Makovicky, curator of dinosaurs at The Field Museum.

"It not only provides definitive evidence for a more global distribution and a longer history for dromaeosaurs than was previously known, but also suggests that dromaeosaurs on northern and southern continents took different evolutionary routes after the landmasses that they had occupied, drifted apart." The Buitreraptor fossil was found in northwestern Patagonia (the southern end of the South America continent) about 700 miles southwest of Buenos Aires.

The new find suggests such raptors go back much further in time than previously thought.