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Downthrow :: Downthrow (n.) The sudden drop or depression of the strata of rocks on one side of a fault. See Throw, n..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Petroleum :: Petroleum (n.) Rock oil, mineral oil, or natural oil, a dark brown or greenish inflammable liquid, which, at certain points, exists in the upper strata of the earth, from whence it is pumped, or forced by pressure of the gas attending it. It consists of a complex mixture of various hydrocarbons, largely of the methane series, but may vary much in appearance, composition, and properties. It is refined by distillation, and the products include kerosene, benzine, gasoline, paraffin, etc..

Euritte :: Euritte (n.) A compact feldspathic rock; felsite. See Felsite.

Debris :: Debris (n.) Broken and detached fragments, taken collectively; especially, fragments detached from a rock or mountain, and piled up at the base..

Graywacke :: Graywacke (n.) A conglomerate or grit rock, consisting of rounded pebbles sand firmly united together..

Sediment :: Sediment (n.) The material of which sedimentary rocks are formed.

Microlite :: Microlite (n.) A minute inclosed crystal, often observed when minerals or rocks are examined in thin sections under the microscope..

Rag :: Rag (n.) A coarse kind of rock, somewhat cellular in texture..

Roll :: Roll (v. i.) To incline first to one side, then to the other; to rock; as, there is a great difference in ships about rolling; in a general semse, to be tossed about..

Tufa :: Tufa () A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria..

Wacky :: Wacky (n.) A soft, earthy, dark-colored rock or clay derived from the alteration of basalt..

Poecilitic :: Poecilitic (a.) Mottled with various colors; variegated; spotted; -- said of certain rocks.

Oil :: Oil (n.) Any one of a great variety of unctuous combustible substances, not miscible with water; as, olive oil, whale oil, rock oil, etc. They are of animal, vegetable, or mineral origin and of varied composition, and they are variously used for food, for solvents, for anointing, lubrication, illumination, etc. By extension, any substance of an oily consistency; as, oil of vitriol..

Potter :: Potter (n.) One who hawks crockery or earthenware.

Productus :: Productus (n.) An extinct genus of brachiopods, very characteristic of the Carboniferous rocks..

Inaccessible :: Inaccessible (a.) Not accessible; not to be reached, obtained, or approached; as, an inaccessible rock, fortress, document, prince, etc..

Cradle :: Cradle (n.) A bed or cot for a baby, oscillating on rockers or swinging on pivots; hence, the place of origin, or in which anything is nurtured or protected in the earlier period of existence; as, a cradle of crime; the cradle of liberty..

Butte :: Butte (n.) A detached low mountain, or high rising abruptly from the general level of the surrounding plain; -- applied to peculiar elevations in the Rocky Mountain region..

Wreck :: Wreck (v. t.) The destruction or injury of a vessel by being cast on shore, or on rocks, or by being disabled or sunk by the force of winds or waves; shipwreck..

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