1. n. [Geology]

A carbonate sedimentary rock predominantly composed of calcite of organic, chemical or detrital origin. Minor amounts of dolomite, chert and clay are common in limestones. Chalk is a form of fine-grained limestone.

See related terms: barite,  clean,  dirty,  evaporite,  micrite,  reef,  source rock,  stylolite,  vugular porosity