LIMESTONE :- Limestones are familiar and widespread rocks that form the peaks of mountains in the Himalayas, form characteristic karst landscapes and many spectacular gorges throughout the world. Limestone is also important in the built environment, being the construction material for structures ranging from the Pyramids of Egypt to many palaces and churches. As well as being a good building stone in many places, limestone is also important as a source of lime to make cement, and is hence a component of all concrete, brick and stone buildings and other structures, such as bridges and dams. Limestone strata are common through much of the stratigraphic record and include some very characteristic rock units, such as the Late Cretceous Chalk, a relatively soft limestone that is found in many parts of the world. The origins of these rocks lie in a range of sedimentary environments: some form in continental settings, but the vast majority are the products of processes in ...
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