Footprints point to early man in US

Los Angeles – Footprints dating back 23 000 years have been discovered in the United States, suggesting humans settled North America long before the end of the last Ice Age, research published this week showed.

The findings push back the date at which the continent was colonised by its first inhabitants by thousands of years.

The footprints were left in mud on the banks of a longsince dried up lake, which is now part of a New Mexico desert.

Sediment filled the indentations and hardened into rock, protecting evidence of our ancient relatives and giving scientists a detailed insight into their lives.

“Many tracks appear to be those of teenagers and children; large adult footprints are less frequent,” write the authors of the study published in the American journal, Science.

“One hypothesis for this is the division of labour, in which adults are involved in skilled tasks whereas ‘fetching and carrying’ are delegated to teenagers.

“Children accompany the teenagers and, collectively, they leave a higher number of footprints.”

Researchers also found tracks left by mammoths, prehistoric wolves and even giant sloths, which appear to have been around at the same time as the humans visited the lake.

The Americas were the last continent to be reached by humanity.

For decades, the most commonly accepted theory has been that settlers came to North America from eastern Siberia across a land bridge – the present-day Bering Strait.

From Alaska, they headed south to kinder climes.

Archaeological evidence, including spearheads used to kill mammoths, has long suggested a 13 500-year-old settlement associated with so-called Clovis culture.

This was considered the continent’s first civilisation and the forerunner of groups that became known as Native Americans.

However, the notion of Clovis culture has been challenged over the past 20 years, with new discoveries that have pushed back the age of the first settlements.

Generally, even this pushed-back estimate of the age of the first settlements had not been more than 16 000 years, after the end of the so-called “last glacial maximum”. –