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proposed in 1903 by Grabau as a part of his calcilutite, calcarenite and calcirudite classification system based upon the size of the detrital grains composing a limestone. Depending on roundness of the grains, calcirudite is the carbonate equivalent of either a breccia, in the case of predominantly angular grains, or conglomerate, in the case of predominantly rounded grains. Calcirudites

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