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Classification of limestones should consider (1) mode of origin of CaCO3 (chemical [biochemical or physicochemical] and mechanical), (2) form of CaCO3 (skeletal [secretionary] or nonskeletal [accre- tionary or particulate]), and (3) the processes of deposition and accumulation of units of limestone. The biological and other genetic aspects of limestones are interrelated but commonly difficult to evaluate. Studies of modern carbonate sediments demonstrate that organisms play a dominant role in the forma-tion of skeletal and nonskeletal material. Disintegration of skeletal material to fine sand and smaller size generally renders such material unrecognizable regarding its skeletal nature and biological...

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