Calcarenite is a clastic limestone consisting predominantly of sand-grade (1/16 to 2mm in diameter) calcitic or aragonitic particles (allochems, Folk, 1959); it is a consolidated carbonate sand. Grabau (1904) introduced this term as calcarenyte in his genetic classification of sedimentary rocks to convey the basic calcareous composition, arenite grain size, and exogenetic or clastic nature of the rock.
Calcarenite, like the related terms calcirudite and calcilutitethat describe the coarser-grained and the finer-grained limestones, respectively, has survived as a general term that is particularly useful for field descriptions. It may be qualified by terms that indicate the dominant clastic components—e.g., brachiopod calcarenite, crinoid calcarenite, oolitic calcarenite. In the strict sense, the term should not be applied to autochthonous accumulations such as reef rock or coquinoid limestones (oyster banks), but should be employed only to describe limestones that have a mechanically...
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