Re: Trachilos footprints ~6 Ma
On Thu, Oct 14, 2021 at 01:02 AM, Gareth Morgan wrote:
https://whc.unesco.org/fr/listesindicatives/5851/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.