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Footprint find on Crete may push back date humans began to walk upright

September 1, 2017 3:36 AM
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Footprint find on Crete may push back date humans began to walk upright

HUMAN-like footprints have been found stamped into an ancient sea shore fossilised beneath the Mediterranean island of Crete.

That’s a time when palaeontologists believe our human ancestors had only apelike feet.

But a study into the Trachilos, western Crete, prints determines them to feature prominent human features and an upright stance.

And that’s significant as the human foot has a unique shape. It combines a long sole, five short toes, no claws — and a big toe.

In comparison, the foot of a Great Ape look much more like a human hand.

And that step in evolution wasn’t believed to have taken place until some 4 million years ago.

“The interpretation of these footprints is potentially controversial,” the study’s abstract admits.

“The print morphology suggests that the trackmaker was a basal member of the clade Hominini (human ancestral tree), but as Crete is some distance outside the known geographical range of pre-Pleistocene (2.5 million to 11,700 years ago) hominins we must also entertain the possibility that they represent a hitherto unknown late Miocene primate that convergently evolved human-like foot anatomy.”

Put simply, the study argues there was another — previously unidentified — human-like creature walking the Earth long before we believed it was possible.

The existing pool of evidence into humanity’s origins is built around Australopithecus fossils found in south and East Africa, along with a 3.7 million-year-old set of upright hominin (human ancestor) footprints found in Tanzania.

Called the Laetoli footprints, these are believed to have been made by Australopithecus with a narrow heel and poorly defined arch.

In contrast, a set of 4.4 million-year-old prints found in Ethiopia are believed from the hominin Ardipithecus ramidus. These prints are much closer to that of an ape than a modern human.

But the Trachilos footprints, at 5.7 million years, appear to be more human than Ardipithecus.

They were found by the study’s lead author, Gerard Gierlinski, while he was holidaying on the island of Crete in 2002. The palaeontologist at the Polish Geological Institute has taken more than a decade to analyse his find.

The Trachilos prints have a big toe very similar to our own in size, shape and position. It has a distinct ball on its sole. It has the human-like sole. It doesn’t have claws.

They were pressed into the firm but wet sands of a small river delta at a time when the Sahara was lush and green, and savanna extended from North Africa around the Eastern Mediterranean. Crete itself was still part of the Greek mainland then.

They have been dated using foraminifera (analysis of marine microfossils) as well as their position beneath a distinctive sedimentary rock layer created when the Mediterranean Sea dried up about 5.6 million years ago.

The footprints’ discovery also comes shortly after the fragmentary fossils of a 7.2 million-year-old primate Graecopithecus, discovered in Greece and Bulgaria, were reclassified as belonging to the human ancestral tree.

Source: news.com.au

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