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It's a wondrous story, worldwide, about a region that geologists call... "tectonic horns".
Thanks to its unique geological formations, Meteora has been classified by UNESCO as a site of unique natural and geological heritage. As geologists note, their creation took tens of millions of years.
38-26 million years ago, during the Oligocene and Miocene, the area was located in the 'Mesohellenic groove', a sea trench that started north-west of Kastoria and ended in the Thessalian Campos. It consisted of sedimentary rocks deposited on the seabed and included alternations of sandstones, conglomerates and clays.
During the Lower Miocene orogeny (20-25 million years ago), the sea receded and orogeny began, with folding and intense fracturing of the rocks. This created a series of 'tectonic horns' and 'tectonic trenches'. These formations, combined with the fractures and erosion of the unstable clay rocks, created the wondrous landscape we see today.