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Roscommon’s main geological history is in the Carboniferous period. Nearly all the county has Limestone near the surface, which was deposited in a shallow tropical sea covering much of Ireland around 330 million years ago.
Thick beds of Limestone occur and are continuous over a very wide area
Roscommon, is mostly underlain by the Carboniferous Limestone and as this was formed by a shallow tropical sea, potentially fossils may be found anywhere, but because the Limestone reflects different local environments on the sea floor, they help give Gately Building Stone a beautiful array of Natural Colours ranging from Natural Browns to Grey Blue
What is Limestone?
Limestone is a sedimentary rock composed primarily of calcite, a calcium carbonate mineral with a chemical composition of CaCO3. It usually forms in clear, calm, warm, shallow marine waters.
Limestone is usually a biological sedimentary rock, forming from the accumulation of shell, coral, algal, fecal, and other organic debris. It can also form by chemical sedimentary processes, such as the precipitation of calcium carbonate from lake or ocean water.