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Apart from these volcanic rock types, there are also examples of sedimentary rocks (Provatas, S. Milos) and metamorphic rocks. The former were believed to have been formed 14 million years ago and the latter 33 and 64 million years ago.
At this point, it is worth mentioning some geological features which are a direct result of the island's volcanic nature. Firstly, the two extinct volcanoes; the one at Firiplaka, on the south coast, has an impressive and well-preserved crater, with a diameter of 1.700 metres and height of 220 metres approximately. The other is at Trachylas, NNW Milos, although only a small part of it remains. Another geological formation is that of the steep-sided hills such as Castro, which rises above Plaka, and Prophet Elias. These volcanic «plugs» were formed when magma, from under the earth’s crust, failed to erupt, due to low gas pressure. This molten rock solidified inside the volcanic pipe to form a hard rock called andesite. Subsequently, the softer surrounding rock was worn away exposing the hard rock cylinder or «plug». |
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