In April of 1863, Jules Desnoyers, of the French National Museum, came to St. Prest, in northwestern France, to gather fossils. From the sandy gravels, he recovered part of a rhinoceros tibia. He noticed on the bone a series of narrow grooves. He also observed small circular marks that could well have been made by a pointed implement. To Desnoyers, some of the grooves appeared to have been produced by a sharp knife or blade of flint. If Desnoyers concluded correctly that the marks on many of the bones had been made by flint implements, then it would appear that human beings had been present in France during Pliocene era. It is believed that at the end of the Pliocene, about 2 million years ago, the modern human species had not yet come into being.
Jules Pierre François Stanislaus Desnoyers (October 8, 1800 – 1887) was a French geologist and archaeologist. Desnoyers was born at Nogent-le-Rotrou, in the department of Eure-et-Loir. Becoming interested in geology at an early age, he was one of the founders of the Geological Society of France in 1830.
Jules Pierre François Stanislaus Desnoyers (October 8, 1800 – 1887) was a French geologist and archaeologist. Desnoyers was born at Nogent-le-Rotrou, in the department of Eure-et-Loir. Becoming interested in geology at an early age, he was one of the founders of the Geological Society of France in 1830.

The prominent British geologist Sir Charles Lyell suggested the marks were made by rodents' teeth, but French prehistorian Gabriel de Mortillet said the marks could not have been made by animals. He instead suggested that they were made by sharp stones moved by geological pressure across the bones. Louis Bourgeois, a clergyman who had also earned a reputation as a distinguished paleontologist, carefully searched the strata at St. Prest for such evidence. By his patient research he eventually found a number of flints that he believed were genuine tools and made them the subject of a report to the Academy of Sciences in January, 1867.
The famous French anthropologist Armand de Quatrefages said the tools included scrapers, borers, and lance points. Even this did not satisfy de Mortillet, who said the flints discovered by Bourgeois at St. Prest had been chipped by geological pressure. In 1910, the famous American paleontologist Henry Fairfield Osborn made these interesting remarks in connection with the presence of stone tools at St. Prest: "the earliest traces of man in beds of this age were the incised bones discovered by Desnoyers at St. Prest near Chartres in 1863. Doubt as to the artificial character of these incisions has been removed by the recent explorations of Laville and Rutot, which resulted in the discovery of eolithic flints, fully confirming the discoveries of the Abbé Bourgeois in these deposits in 1867."
Michael Cremo said, “So as far as the discoveries at St. Prest are concerned, it should now be apparent that we are dealing with paleontological problems that cannot be quickly or easily resolved. Certainly, there is not sufficient reason to categorically reject these bones as evidence for a human presence in the Pliocene.”
Sources :
Hidden History of the Human Race by Michael Cremo;
http://en.wikipedia.org/wiki/Jules_Desnoyers
Pic Source :
http://www.cartage.org.lb/en/themes/sciences/lifescience/physicalanthropology/humangeneticevolution/EarlyHominids/pliocene.gif
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