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..

Lern More About Geology

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..
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..
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.
Cambrian :: Cambrian (a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.
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..
Ludlow Group :: Ludlow group () A subdivision of the British Upper Silurian lying below the Old Red Sandstone; -- so named from the Ludlow, in Western England. See the Chart of Geology..
Purbeck Beds :: Purbeck beds () The strata of the Purbeck stone, or Purbeck limestone, belonging to the Oolitic group. 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..
Muschelkalk :: Muschelkalk (n.) A kind of shell limestone, whose strata form the middle one of the three divisions of the Triassic formation in Germany. See Chart, under Geology..
Permian :: Permian (n.) The Permian period. See Chart of Geology.
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..
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..
Keuper :: Keuper (n.) The upper division of the European Triassic. See Chart of Geology.
Geology :: Geology (n.) A treatise on the science.
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..
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..
Glacialist :: Glacialist (n.) One who attributes the phenomena of the drift, in geology, to glaciers..
Geognosy :: Geognosy (n.) That part of geology which treats of the materials of the earth's structure, and its general exterior and interior constitution..
Stratocracy :: Stratigraphy (n.) That branch of geology which treats of the arrangement and succession of strata.
#NAME? :: -logy () A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy..
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