During the night shift each evening, students mapped the shape of the seafloor at high resolution. 'Usually if we go somewhere and do these measurements,' says Geersen, 'then we find something interesting.'
In research published in PNAS, Geersen and his colleagues say this piece of ancient hunting architecture may have been used to corral and hunt reindeer, adding a level of sophistication to the prehistoric hunter-gatherers who lived 10,000 to 11,000 years ago.
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