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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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..

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

Geognosy :: Geognosy (n.) That part of geology which treats of the materials of the earth's structure, and its general exterior and interior constitution..

Laramie Group :: Laramie group () An extensive series of strata, principally developed in the Rocky Mountain region, as in the Laramie Mountains, and formerly supposed to be of the Tertiary age, but now generally regarded as Cretaceous, or of intermediate and transitional character. It contains beds of lignite, often valuable for coal, and is hence also called the lignitic group. 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.) A treatise on the science.

Mesozoic :: Mesozoic (a.) Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology..

Medina Epoch :: Medina epoch () A subdivision of the Niagara period in the American upper Silurian, characterized by the formations known as the Oneida conglomerate, and the Medina sandstone. See the Chart of Geology..

Geologize :: Geologize (v. i.) To study geology or make geological investigations in the field; to discourse as a geologist.

Dynamical :: Dynamical (a.) Relating to physical forces, effects, or laws; as, dynamical geology..

Permian :: Permian (n.) The Permian period. See Chart of Geology.

Stratocracy :: Stratigraphy (n.) That branch of geology which treats of the arrangement and succession of strata.

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..

Geological :: Geological (a.) Of or pertaining to geology, or the science of the earth..

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..

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..

Micro-geology :: Micro-geology (n.) The part of geology relating to structure and organisms which require to be studied with a microscope.

Micro-geological :: Micro-geological (a.) Of or pertaining to micro-geology.

Period :: Period (n.) One of the great divisions of geological time; as, the Tertiary period; the Glacial period. 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..