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Trenton Period :: Trenton period () A subdivision in the lower Silurian system of America; -- so named from Trenton Falls, in New York. The rocks are mostly limestones, and the period is divided into the Trenton, Utica, and Cincinnati epochs. See the Chart of Geology..

Atrypa :: Atrypa (n.) A extinct genus of Branchiopoda, very common in Silurian limestones..

Peagrit :: Peagrit (n.) A coarse pisolitic limestone. See Pisolite.

Septarium :: Septarium (n.) A flattened concretionary nodule, usually of limestone, intersected within by cracks which are often filled with calcite, barite, or other minerals..

Eozoon :: Eozoon (n.) A peculiar structure found in the Archaean 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..

Kiln :: Kiln (n.) A large stove or oven; a furnace of brick or stone, or a heated chamber, for the purpose of hardening, burning, or drying anything; as, a kiln for baking or hardening earthen vessels; a kiln for drying grain, meal, lumber, etc.; a kiln for calcining limestone..

Scaglia :: Scaglia (n.) A reddish variety of limestone.

Carbonate :: Carbonate (n.) A salt or carbonic acid, as in limestone, some forms of lead ore, etc..

Effloresce :: Effloresce (v. i.) To become covered with a whitish crust or light crystallization, from a slow chemical change between some of the ingredients of the 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..

Lithography :: Lithography (n.) The art or process of putting designs or writing, with a greasy material, on stone, and of producing printed impressions therefrom. The process depends, in the main, upon the antipathy between grease and water, which prevents a printing ink containing oil from adhering to wetted parts of the stone not covered by the design. See Lithographic limestone, under Lithographic..

Oriskany :: Oriskany (a.) Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age..

Subcarboniferous :: Subcarboniferous (a.) Of or pertaining to the lowest division of the Carboniferous formations underlying the proper coal measures. It was a marine formation characterized in general by beds of limestone.

Lias :: Lias (n.) The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. See the Chart of Geology.

Lithodome :: Lithodome (n.) Any one of several species of bivalves, which form holes in limestone, in which they live; esp., any species of the genus Lithodomus..

Eozoonal :: Eozoonal (a.) Pertaining to the eozoon; containing eozoons; as, eozoonal limestone..

Marble :: Marble (n.) A massive, compact limestone; a variety of calcite, capable of being polished and used for architectural and ornamental purposes. The color varies from white to black, being sometimes yellow, red, and green, and frequently beautifully veined or clouded. The name is also given to other rocks of like use and appearance, as serpentine or verd antique marble, and less properly to polished porphyry, granite, etc..

Marmorosis :: Marmorosis (n.) The metamorphism of limestone, that is, its conversion into marble..

Lumachella :: Lumachella (n.) A grayish brown limestone, containing fossil shells, which reflect a beautiful play of colors. It is also called fire marble, from its fiery reflections..

Dolomite :: Dolomite (n.) A mineral consisting of the carbonate of lime and magnesia in 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..

Chondrodite :: Chondrodite (n.) A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone..

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