calcreous
Calcreous, also spelled calcareous, is an adjective used in geology, paleontology, soil science, and biology to describe substances or formations that are composed of calcium carbonate or contain significant amounts of calcium carbonate minerals such as calcite or aragonite. The term derives from the Latin calcareus, meaning limestone-like, from calx, lime.
In geology and sedimentology, calcreous materials are common in the fossil record and in modern sediments.
In biology, calcreous describes shells, skeletons, and tests of organisms that are made primarily of calcium
In soils and landscapes, calcreous soils are those containing a substantial fraction of calcium carbonate, often