Your thoughts on this latest theory on migration into the Americas?
Recent geological and climatic studies have revealed that there was NEVER a clear passage from Siberia to the heartland of North America between around 25,000 BC and 10,000 BC. Archaeological digs in the past decade have revealed that the oldest Clovis points are along the Savannah River between South Carolina and Georgia. The same team from the University of South Carolina identified Pre-Clovis artifacts below the Clovis strata that radiocarbon dated to 15,000 BP and 50,000 BP. The last date is controversial because the stone artifacts look like the tools made by Homo Erectus, not modern humans. Stone points have been found in Virginia that are identical to Solutrean points in Western Europe, which were produced between 22,000–17,000 BP. It was not possible to accurately radiocarbon date the Virginia points, but they were found in ancient soil layer.
The following text is an excerpt from an article on indigenous American DNA, which was published in the University of California-Berkeley News website. The article states that humans arrived in the Americas around 15,000 BP, but fails to mention that the oldest known human skeletons found in southern Mexico and western South America predate by several thousand years to opening of a land route from western Alaska to the remainder of North America.
The Beringian standstill
Clues came from a 2007 paper and later a 2015 study by Hlusko’s coauthor Dennis O’Rourke, in which scientists deduced from the DNA of Native Americans that they split off from other Asian groups more than 25,000 years ago, even though they arrived in North American only 15,000 years ago. Their conclusion was that Native American ancestors settled for some 10,000 years in an area between Asia and North America before finally moving into the New World. This so-called Beringian standstill coincided with the height of the Last Glacial Maximum between 18,000 and 28,000 years ago.
According to the Beringian standstill hypothesis, as the climate became drier and cooler as the Last Glacial Maximum began, people who had been living in Siberia moved into Beringia. Gigantic ice sheets to the east prohibited migration into North America. They couldn’t migrate southwest because of a large expanse of a treeless and inhospitable tundra. The area where they found refuge was a biologically productive region thanks to the altered ocean currents associated with the last ice age, a landmass increased in size by to the lower sea levels. Genetic studies of animals and plants from the region suggest there was an isolated refugium in Beringia during that time, where species with locally adaptive traits arose. Such isolation is ripe for selection on genetic variants that make it easier for plants, animals and humans to survive.
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