The researchers speculate that these early Californians could have instead been species known only from fossils in Europe, Africa and Asia: Neanderthals, a little-known group called Denisovans, or another human forerunner named Homo erectus.'The very honest answer is, we don't know,' said Steven Holen, lead author of the paper and director of the nonprofit Center for American Paleolithic Research in Hot Springs, South Dakota. The mastodon remains were discovered at the Cerutti Mastodon site in San Diego by palaeontologists from the San Diego Natural History Museum during routine work in 1992.
Bones, tusks and molars – many of which had signs that they were deliberately damaged - were found deeply buried alongside large stones that appeared to have been used as hammers and anvils.
Researchers discovered the butchered remains of an enormous mastodon in San Diego, with evidence of chips and fractures made by early humans - but they admit they don't know if they were Homo sapiens, Homo erectus, Neanderthals, or something else.
The bones were found in two rough piles, each with two or three large rocks measuring 10 to 30cm across.
The scientists believe the stones are too heavy to have been carried there in the flow of a stream, and instead suspect they were carried by humans for use as hammerstones and anvils to break the bones apart.
At Girl Friends Meet you'll have all the tools at your disposal to contact and hear from exactly who you are looking for.
You can organize profile photos into albums and even unlock private photo albums on a one-on-one basis.