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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..

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..

Geology :: Geology (n.) A treatise on the science.

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

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..

Niagara Period :: Niagara period () A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology..

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

Lias :: Lias (n.) The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. 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..

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..

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

Cenozoic :: Cenozoic (a.) Belonging to the most recent division of geological time, including the tertiary, or Age of mammals, and the Quaternary, or Age of man. [Written also caenozoic, cainozoic, kainozoic.] See Geology..

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

Geologist :: Geologist (n.) One versed in the science of geology.

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

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

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..

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

Keuper :: Keuper (n.) The upper division of the European Triassic. 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.

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