Lasnamae limestone Estonian Limestones Most of our limestones have evolved during the Ordovician and Silurian periods (500 to 408 milion years ago). Limestone is sedimentary rock and it's thickness in Northern-Estonia is just a little over 100 m, in Southern-Estonia it may be as much as 800 m. Below the P?rnu - Mustvee line limestone sometimes appears even on the ground, though it is mostly covered with a thin layer of Quaternary sediments. In southern areas limestone is also covered with a thick layer of Devonian sandstones. Estonian limestones and dolomites have been in use as building materials for about 3000 years, thus being the second most important building material after wood.
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