Re: Trachilos footprints ~6 Ma


On Thu, Oct 14, 2021 at 01:02 AM, Gareth Morgan wrote:
The fossils and fossil footprints in your reference are in fluvial sedimentary rocks, not marine sedimentary rocks. Here is the paragraph that explains this:

Rocks were formed in a moment of the history of the Earth when the climate was cold and dry, and the sea was not where it is today; it had gone back dozens of kilometres towards the South-East of its current position. The former Pehuén co was a great valley of an ancient river and, in its lowest parts, fresh water accumulated during periods of heavy rains that swept along the mud from the nearest ravines. As a consequence, ponds were formed, that were inhabited by waterfowls, and where pumas, deer, guanacos, bears, horses and strange huge animals that are extent today (Megatherium, Macrauchenia, Stegomastodon) came to drink water.

The tracks of all these creatures were marked on the mud, which after drying and covering with layers of sand and new mud mantles, they were transformed slowly in a succession of semi-consolidated rocks. 


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