Anticosti, a UNESCO World Heritage site in Quebec, Canada, inscribed in September 2023, is a remote island in the Gulf of St. Lawrence renowned for its exceptional fossil record. Spanning over 9,200 square kilometers, it preserves the world’s most complete evidence of marine life from 447 to 437 million years ago, documenting Earth’s first mass extinction. Protected within a national park, biodiversity reserve, and ecological reserves, its untouched cliffs, rivers, and 1,440+ fossil species make it a global scientific treasure, offering insights into ancient climate shifts and ecological collapse.

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