English definition of Geology

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Definition of geology

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Geology (n.) The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series..

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Oryctology :: Oryctology (n.) An old name for mineralogy and geology.

Plutonism :: Plutonism (n.) The theory, early advanced in geology, that the successive rocks of the earth's crust were formed by igneous fusion; -- opposed to the Neptunian theory..

Hamilton Period :: Hamilton period () A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology..

Primordial :: Primordial (a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian..

Rh/tic :: Rh/tic (a.) Pertaining to, or of the same horizon as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology..

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..

Subapical :: Subapennine (a.) Under, or at the foot of, the Apennine mountains; -- applied, in geology, to a series of Tertiary strata of the older Pliocene period..

Corniferous :: Corniferous (a.) Of or pertaining to the lowest period of the Devonian age. (See the Diagram, under Geology.) The Corniferous period has been so called from the numerous seams of hornstone which characterize the later part of the period, as developed in the State of New York..

Chazy Epoch :: Chazy epoch () An epoch at the close of the Canadian period of the American Lower Silurian system; -- so named from a township in Clinton Co., New York. See the Diagram under Geology..

Glacialist :: Glacialist (n.) One who attributes the phenomena of the drift, in geology, to glaciers..

Molasse :: Molasse (n.) A soft Tertiary sandstone; -- applied to a rock occurring in Switzerland. See Chart of Geology.

Quaternary :: Quaternary (n.) The Quaternary age, era, or formation. See the Chart of Geology..

Schoharie Grit :: Schoharie grit () The formation belonging to the middle of the three subdivisions of the Corniferous period in the American Devonian system; -- so called from Schoharie, in New York, where it occurs. See the Chart of Geology..

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..

Chemung Period :: Chemung period () A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which the rocks are well developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology..

Senonian :: Senonian (a.) In european geology, a name given to the middle division of the Upper Cretaceous formation..

Llandeilo Group :: Llandeilo group () A series of strata in the lower Silurian formations of Great Britain; -- so named from Llandeilo in Southern Wales. See Chart of Geology.

Quebec Group :: Quebec group () The middle of the three groups into which the rocks of the Canadian period have been divided in the American Lower Silurian system. See the Chart of Geology.

Geology :: Geology (n.) The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series..

Oolite :: Oolite (n.) A variety of limestone, consisting of small round grains, resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology..