An icy barrier up to 300 stories high – taller than any building on Earth – may have prevented the first people from entering the New World over the land bridge that once connected Asia with the Americas, a new study has found.
These findings suggest that the first people in the Americas instead arrived via boats along the Pacific coast, researchers said.
A major factor influencing the way in which the first Americans arrived were giant ice sheets that once blanketed North America. Previous research suggested that an ice-free corridor between the margins of these ice sheets may have enabled travel from Beringia down to the Great Plains. To help solve this mystery, researchers sought to pinpoint when the ice-free corridor opened. They investigated 64 geological samples taken from six locations spanning 745 miles along the zone where the ice-free corridor was thought to have existed.
The new findings suggest that the ice-free corridor did not fully open until about 13,800 years ago, and the ice sheets"may have been 1,500 to 3,000 feet high in the area where they covered the ice-free corridor," study lead author Jorie Clark, a geologist and archaeologist at Oregon State University, told Live Science.By comparison, the tallest building in the world, the Burj Khalifa in Dubai, stands about 2,722 feet high.
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