A new study sends waves across the academia revealing that there has already been human activity in North America since 131,000 years ago, and not 24,000 years ago as initially thought of. This new study published in "Nature" will definitely change the history books. The startling new archaeological discovery uncovers ancient human activity has been going on in California longer than the general consensus.

University of Wollongong Honorary Principal Fellow Richard Fullgar said claims as extraordinary as this needs extraordinary evidence, IFL Science reported. The evidence is clear and the dates are startling, and the finding is incontrovertible, said Fullgar, who is the co-author of the study. The team discovered in San Diego County a mastodon that has indentations that are presumably done by man-made tools.

Though there are no human remains near the mastodon, which is an extinct distant relative of elephants, the indentations on its tusks suggest human interference, Reuters reported. This includes the use of hammerstones and anvils, which humans and their ancestors used back then.

Using cutting edge uranium dating processes, the archaeologists found that the tusks date back 131,000 years ago. The evidence points to humans because there are no carnivores that may have cause the precise indentation, and there were no erosional events that may have disturbed the location. This means humans used tools to carve the tusks to extract bone marrow, which serves as food for ancient humans since way back 1.5 million years ago.

The new finding will rewrite everything people think they knew about on the migration of human beings across the globe. Center for American Paleolothic Research Co-Director Steven Holen was expecting some extraordinary claims on how the ancient human got to California 131,000 years ago. The archaeologist expect to face criticism, since they didn't really find human remains in the location, but they are confident that it is an authentic archaeological site, said Holen, who is also a co-author of the study.