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A genus of fossil corals, common in the lower Silurian limestones.

h white color, consisting of calcium carbonate, and having the same composition as common limestone.

nesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone.

often of great extent, made up chiefly of fragments of corals, coral sands, and the solid limestone resulting from their consolidation. They are classed as fringing reefs, when they border the land; barrier reefs, when separated from the shore by a broad belt of water; atolls, when they constitute separate islands, usu…

A deposit of coralliferous limestone forming a portion of the middle division of the oölite; -- called also coral-rag.

Composed of corallines; as, coralline limestone.

sometimes used for salad. V. olitoria is also called lamb's lettuce. -- Corn stone, red limestone. [Prov. Eng.] -- Corn violet (Bot.), a species of Campanula. -- Corn weevil. (Zoöl.) (a) A small weevil which causes great injury to grain. (b) In America, a weevil (Sphenophorus zeæ) which attacks the stalk of maize ne…

ame formerly given to certain Silurian brachiopod shells of the genus Spirifer. Delthyris limestone (Geol.), one of the divisions of the Upper Silurian rocks in New York.

n varying proportions. It occurs in distinct crystals, and in extensive beds as a compact limestone, often crystalline granular, either white or clouded. It includes much of the common white marble. Also called bitter spar.

matter covered and an acid proceeding commonly from an external source; as, the walls of limestone caverns sometimes effloresce with nitrate of calcium in consequence of the action in consequence of nitric acid formed in the atmosphere.

Relating to encrinites; containing encrinites, as certain kinds of limestone.

A peculiar structure found in the Archæan limestones of Canada and other regions. By some geologists it is believed to be a species of gigantic Foraminifera, but others consider it a concretion, without organic structure.

Pertaining to the eozoön; containing eozoöns; as, eozoönal limestone.

Limestone containing a large percentage of iron carbonate, and hence turning brown on exposure.

A kind of brittle limestone. [Prov. Eng.] Kirwan.

Consisting of, or resembling, grains; as, a granular substance. Granular limestone, crystalline limestone, or marble, having a granular structure.

Having a granular structure; granular; as, granuliform limestone.

-- Hydraulic jack. See under Jack. -- Hydraulic lime, quicklime obtained from hydraulic limestone, and used for cementing under water, etc. -- Hydraulic limestone, a limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, under water. -- Hydraulic main (Gas Works…

rtaining to, or containing, the petrified cases of the larvæ of certain insects. Indusial limestone (Geol.), a fresh-water limestone, largely composed of the agglomerated cases of caddice worms, or larvæ of caddice flies (Phryganea). It is found in Miocene strata of Auvergne, France, and some other localities.…

dening earthen vessels; a kiln for drying grain, meal, lumber, etc.; a kiln for calcining limestone.