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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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..
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..
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.
#NAME? ::
-logy () A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy..
Mesozoic ::
Mesozoic (a.) Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology..
Paleozoic ::
Paleozoic (a.) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology..
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..
Senonian ::
Senonian (a.) In european geology, a name given to the middle division of the Upper Cretaceous formation..
Geologize ::
Geologize (v. i.) To study geology or make geological investigations in the field; to discourse as a geologist.
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..
Potsdam Group ::
Potsdam group () A subdivision of the Primordial or Cambrian period in American geology; -- so named from the sandstone of Potsdam, New York. 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..
Globuliferous ::
Globuliferous (a.) Bearing globules; in geology, used of rocks, and denoting a variety of concretionary structure, where the concretions are isolated globules and evenly distributed through the texture of the rock..
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..
Portage Group ::
Portage group () A subdivision of the Chemung period in American geology. See 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..
Molasse ::
Molasse (n.) A soft Tertiary sandstone; -- applied to a rock occurring in Switzerland. See Chart of Geology.
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