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limestone

(Encyclopedia)limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making...

Cheddar

(Encyclopedia)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 limestone cl...

Rewa

(Encyclopedia)Rewa rāˈvə [key], 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 tim...

Alpena

(Encyclopedia)Alpena ălpēˈnə [key], city, 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 ch...

Ordovician period

(Encyclopedia)Ordovician period ôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) fr...

Cockpit Country

(Encyclopedia)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 streams. ...

dolomite

(Encyclopedia)dolomite dōˈləmītˌ, dŏlˈə– [key]. 1 Mineral, calcium magnesium carbonate, CaMg (CO3)2. It is commonly crystalline and is white, gray, brown, or reddish in color with a vitreous to pearly lus...

Pittsburg

(Encyclopedia)Pittsburg pĭtsˈbərg [key]. 1 Industrial city (1990 pop. 47,564), Contra Costa co., W Calif., on the edge of the San Francisco Bay area, at the junction of the Sacramento and the San Joaquin rivers;...

Lot, river, France

(Encyclopedia)Lot, river, c.300 mi (483 km) long, rising in the Cévennes Mts., SE France, and flowing W past Mende and Cahors to join the Garonne River. The limestone plateaus through which the Lot winds are inter...

calcareous rock

(Encyclopedia)calcareous rock: see limestone; marble. ...