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Petrogale :: Petrogale (n.) Any Australian kangaroo of the genus Petrogale, as the rock wallaby (P. penicillata)..

Alternant :: Alternant (v. t.) Composed of alternate layers, as some rocks..

Stratum :: Stratum (n.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively..

Sedimentation :: Sedimentation (n.) The act of depositing a sediment; specifically (Geol.), the deposition of the material of which sedimentary rocks are formed..

Scorpaenoid :: Scorpaenoid (a.) Of or pertaining to the family Scorpaenidae, which includes the scorpene, the rosefish, the California rockfishes, and many other food fishes. [Written also scorpaenid.] See Illust. under Rockfish..

Rubble :: Rubble (n.) A mass or stratum of fragments or rock lying under the alluvium, and derived from the neighboring rock..

Laccolith :: Laccolith (n.) A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.

Strike :: Strike (n.) The horizontal direction of the outcropping edges of tilted rocks; or, the direction of a horizontal line supposed to be drawn on the surface of a tilted stratum. It is at right angles to the dip..

Vesicle :: Vesicle (n.) A small cavity, nearly spherical in form, and usually of the size of a pea or smaller, such as are common in some volcanic rocks. They are produced by the liberation of watery vapor in the molten mass..

Metasomatism :: Metasomatism (n.) An alteration in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; -- opposed to ordinary metamorphism, as implying simply a recrystallization..

Garrupa :: Garrupa (n.) One of several species of California market fishes, of the genus Sebastichthys; -- called also rockfish. See Rockfish..

Biotite :: Biotite (n.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica..

Buhrstone :: Buhrstone (n.) A cellular, flinty rock, used for mill stones..

Cancer :: Cancer (n.) A genus of decapod Crustacea, including some of the most common shore crabs of Europe and North America, as the rock crab, Jonah crab, etc. See Crab..

Gobbing :: Gobbing (n.) The process of packing with waste rock; stowing.

Trigonia :: Trigonia (n.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia..

Lithological :: Lithological (a.) Of or pertaining to the character of a rock, as derived from the nature and mode of aggregation of its mineral contents..

Size :: Size (n.) Extent of superficies or volume; bulk; bigness; magnitude; as, the size of a tree or of a mast; the size of a ship or of a rock..

Siphonarid :: Siphonarid (n.) Any one of numerous species of limpet-shaped pulmonate gastropods of the genus Siphonaria. They cling to rocks between high and low water marks and have both lunglike organs and gills.

Cradle :: Cradle (v. t.) To lay to rest, or rock, as in a cradle; to lull or quiet, as by rocking..

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