Marble, metamorphic rock composed wholly or in large part of calcite or dolomite crystals, the crystalline texture being the result of metamorphism of limestone by heat and pressure. The term ...

Coral reefs, limestone formations produced by living organisms, found in shallow, tropical marine waters. In most reefs, the predominant organisms are stony corals, colonial cnidarians that se...

Alpena, city (1990 pop. 11,354), seat of Alpena co., N Mich., on Thunder Bay, an arm of Lake Huron; inc. 1871. Limestone quarried nearby is used to make cement, Alpena's chief manufacture. Cem...

Cheddar, village, Somerset, SW England. It is chiefly a tourist center. Limestone is quarried, and strawberries are grown. Nearby Cheddar Gorge towers c.400 ft (120 m) high, with imposing lime...

Rewa, walled city (1991 pop. 128,648), Madhya Pradesh state, central India. It is the administrative center of a district rich in coal, corundum, and limestone. Rewa is a market for timber, gr...

Cockpit Country, hilly region on the plateau of Jamaica, c.200 sq mi (520 sq km), W central Jamaica. Composed of limestone rock, the region has many sink holes, caverns, and subterranean strea...

Moberly, city (1990 pop. 12,839), Randolph co., N central Mo.; inc. 1868. Its manufactures include instant ice packs, automobile components, and gym equipment. Limestone quarries are in the vi...

Lesse, river, c.50 mi (80 km) long, rising in the Ardennes, SE Belgium, and flowing northwest to join the Meuse River near Dinant. It passes in its middle course through underground limestone ...

Oolite, rock composed of small concretions, usually of calcium carbonate, containing a nucleus and clearly defined concentric shells. In the British Isles oolitic limestone is characteristic o...

Beauce, region, in Orléanais, N France, in the Paris Basin, between the Seine and Loir rivers. It now comprises Eure-et-Loir dept. and parts of Loiret and Loir-et-Cher. It is the granary of Fr...