Les Sireniens: A Journey Back in Time

Les Sireniens, located north of Castellane in the Alpes-de-Haute-Provence, is a remarkable paleontological site where visitors can admire numerous sirenian bone fossils. These fossils are the preserved remains of marine mammals that lived in this area approximately 40 million years ago, when the region was covered by a warm sea. The site is considered one of the most prestigious within the Haute-Provence Geological Nature Reserve. The Sirenians were herbivorous marine mammals, ancestors of today's dugongs and manatees. The Castellane site is exceptional due to the number, age, and quality of conservation of these fossils. Over 200 fossil bones have been discovered, including ribs, vertebrae, skulls, and limb bones. These findings have provided valuable insights into the evolution and transformations of these ancient creatures. The area has been carefully redeveloped to protect the fossils and welcome visitors. A parking area is available at the Col des Lèques, from which a marked trail leads to the site. The hike is relatively easy, making it suitable for families and casual hikers. Along the way, explanatory panels provide information about the geological context and the history of the Sirenians. The trail crosses meadows and a pine forest before arriving at the fossil site. The discovery of sirenian fossils at an altitude of 1000 meters reveals a key moment in the history of the Alps. The collision of continental blocks around 35 million years ago caused the marine sediments to rise, creating the alpine reliefs we see today.