The researchers have discovered two types of traces: probably two lines made by a single line made by V-shaped transport and an X-shaped structure. The traces indicate that these sles are not by animals, but probably with materials and even children.
Matthew Bennett, a leading researcher at the University of Bornmouth, explains that these drawing scars are rare physical proof of early transportation methods. To verify their theories, the team built and tested similar sleds, and found that modern marks coincided with those in New Mexico.
This discovery completes an increasing number of evidence that people have reached America much earlier than they thought before – perhaps 30,000 years ago.
Source: Ferra
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