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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..

Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

Pearlstone :: Pearlstone (n.) A glassy volcanic rock of a grayish color and pearly luster, often having a spherulitic concretionary structure due to the curved cracks produced by contraction in cooling. See Illust. under Perlitic..

Sheet :: Sheet (v. t.) An extensive bed of an eruptive rock intruded between, or overlying, other strata..

Alternate :: Alternate (v. i.) To vary by turns; as, the land alternates between rocky hills and sandy plains..

Smock :: Smock (v. t.) To provide with, or clothe in, a smock or a smock frock..

Frockless :: Frockless (a.) Destitute of a frock.

Firework :: Firework (n.) A device for producing a striking display of light, or a figure or figures in plain or colored fire, by the combustion of materials that burn in some peculiar manner, as gunpowder, sulphur, metallic filings, and various salts. The most common feature of fireworks is a paper or pasteboard tube filled with the combustible material. A number of these tubes or cases are often combined so as to make, when kindled, a great variety of figures in fire, often variously colored. The skyrocke

Rocket :: Rocket (n.) Rocket larkspur. See below.

Chain Wheel :: Chain wheel () A chain pulley, or sprocket wheel..

Rider :: Rider (n.) Rock material in a vein of ore, dividing it..

Salina Period :: Salina period () The period in which the American Upper Silurian system, containing the brine-producing rocks of central New York, was formed. See the Chart of Geology..

Costeaning :: Costeaning (n.) The process by which miners seek to discover metallic lodes. It consist in sinking small pits through the superficial deposits to the solid rock, and then driving from one pit to another across the direction of the vein, in such manner as to cross all the veins between the two pits..

Serpentine :: Serpentine (n.) A mineral or rock consisting chiefly of the hydrous silicate of magnesia. It is usually of an obscure green color, often with a spotted or mottled appearance resembling a serpent's skin. Precious, or noble, serpentine is translucent and of a rich oil-green color..

Zootic :: Zootic (a.) Containing the remains of organized bodies; -- said of rock or soil.

Gossan :: Gossan (n.) Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein..

Schist :: Schist (n.) Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The common kinds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar..

Eozoic :: Eozoic (a.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoon has been found..

Rockfish :: Rockfish (n.) An American fresh-water darter; the log perch.

Water Rocket :: Water rocket () A kind of firework to be discharged in the water.

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