 More sophisticated tools, worked on both sides of the stone and dating to 600,000 BC, were found in the Cave of Escale at Saint Estėve-Janson, and tools from 400,000 BC and some of the first fireplaces in Europe were found at Terra Amata in Nice.Tools dating to the Middle Paleolithic (300,000 BC) and Upper Paleolithic (30,000–10,000 BC) were discovered in the Observatory Cave, in the Jardin Exotique of Monaco.The Paleolithic period in Provence saw great changes in the climate.