The Nicols spent much of their time in southern France where young Mary became fluent in French. In 1925, when Mary was 12, the Nicols stayed at the commune, Les Eyzies, at a time when Elie Peyrony, a French archeologist and prehistorian, was excavating one of the caves there. Peyrony was not excavating scientifically during that early stage of archaeology and did not understand the significance of much of what he found. Mary received permission to go through the remnants of his dig and this was where her interests in prehistory and archaeology were sparked. She started a collection of points, scrapers, and blades from the dump and developed her first system of classification.