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A slowly formed stratovolcano
Despite appearances, the Sancy massif is a volcano or, more precisely, a stratovolcano made up of several volcanoes nested within each other following successive eruptions. Its slow formation began 5 million years ago and ended around 250,000 years ago. It led to many different types of volcanic activity resulting in a wide variety of rocks, materials and landscapes that include rounded peaks, vast plains and sharp peaks.
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