Devonian limestone is a type of sedimentary rock formed during the Devonian period, which lasted from about 419 to 359 million years ago. This limestone primarily consists of calcium carbonate, derived from the remains of marine organisms like corals and shellfish. It often contains fossils, providing valuable insights into ancient marine environments. The formation of Devonian limestone typically occurs in shallow, warm seas where sediments accumulate over time. This rock is commonly found in various regions around the world, including parts of North America and Europe, and is used in construction and as a raw material in various industries.