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The Paleolithic scholar Andre Leroi-Gourhan believes that Lascaux was decorated between the end of Solutrean art and the beginning of Magdalenian art (c.15,000-13,000 BCE).According to Leroi-Gourhan, the style of Lascaux's paintings was consistent with other art discovered during this period.This worsened during the 2000s, prompting the French Ministry of Culture to organize an international symposium in Paris in 2009 ("Lascaux and Preservation Issues in Subterranean Environments") to debate and resolve the problem.
There are two exits from the Hall of the Bulls: one leads to the Axial Gallery, a dead end; the other to the main Passageway.
It is now established that the cave interior closest to the entrance - including the Hall of the Bulls and the Painted Gallery - would have been bright enough to work by for about one hour, for several days each year.
Chronological questions about the age of Lascaux's cave paintings, over what period they were created, and the identity of the oldest art in the complex, are still being debated.
By 1955, much of the cave's parietal art was beginning to deteriorate due to the amount of carbon dioxide exhaled by the 1200 daily visitors, and other environmental problems. As a result, in 1963 the site was closed to the public.
Since then, more threats to the integrity of Lascaux's cave paintings have been caused by microbial and fungal growths.