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Mosasauria :: Mosasauria (n. pl.) An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved tteth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria..

Heliolite :: Heliolite (n.) A fossil coral of the genus Heliolites, having twelve-rayed cells. It is found in the Silurian rocks..

Rock Staff :: Rock staff (v. i.) An oscillating bar in a machine, as the lever of the bellows of a forge..

Jack :: "Jack (n.) A large, California rock fish (Sebastodes paucispinus); -- called also boccaccio, and merou..

Crees :: Crees (n. pl.) An Algonquin tribe of Indians, inhabiting a large part of British America east of the Rocky Mountains and south of Hudson's Bay..

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

Dip :: Dip (v. i.) To incline downward from the plane of the horizon; as, strata of rock dip..

Archil :: Archil (n.) A violet dye obtained from several species of lichen (Roccella tinctoria, etc.), which grow on maritime rocks in the Canary and Cape Verd Islands, etc..

Magma :: Magma (n.) The glassy base of an eruptive rock.

Floor :: Floor (n.) The rock underlying a stratified or nearly horizontal deposit.

Reefy :: Reefy (a.) Full of reefs or rocks.

Pebble :: Pebble (n.) Transparent and colorless rock crystal; as, Brazilian pebble; -- so called by opticians..

Rock Shaft :: Rock shaft () A shaft that oscillates on its journals, instead of revolving, -- usually carrying levers by means of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft..

Lherzolite :: Lherzolite (n.) An igneous rock consisting largely of chrysolite, with pyroxene and picotite (a variety of spinel containing chromium)..

Tamping :: Tamping (n.) The act of one who tamps; specifically, the act of filling up a hole in a rock, or the branch of a mine, for the purpose of blasting the rock or exploding the mine..

Catskill Period :: Catskill period () The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill mountains, and extend south and west under the Carboniferous formation. See the Diagram under Geology..

Pilotage :: Pilotage (n.) The pilot's skill or knowledge, as of coasts, rocks, bars, and channels..

Stick :: Stick (v. t.) Any long and comparatively slender piece of wood, whether in natural form or shaped with tools; a rod; a wand; a staff; as, the stick of a rocket; a walking stick..

Boulder :: Boulder (n.) A mass of any rock, whether rounded or not, that has been transported by natural agencies from its native bed. See Drift..

Hypocrystalline :: Hypocrystalline (a.) Partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass.

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