Öland's Mysterious Limestone Secret

Stora alvaret, a limestone plain about half the size of the island of Öland, was formed under the sea about 500 million years ago. It gradual hardened to become limestone and drifted north, creating this plain. Today, Stora alvaret contains a rich fossil record of some marine creatures that contribute, such Orthoceras found in some geomorphological structures on the island. The limestone plain was created by glacial action before the Ice Age. The agricultural landscape of southern Öland that includes this limestone plateau, Stora alvaret, was designated as a World Heritage Site by UNESCO in 2000, for the extraordinary biodiversity in this place, and its prehistory as well as the way how man has adapted to the natural conditions.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons