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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.

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..

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..

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

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

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.

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..

Miocene :: Miocene (n.) The Miocene period. See 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..

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

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.

Portage Group :: Portage group () A subdivision of the Chemung period in American geology. See 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..

Purbeck Beds :: Purbeck beds () The strata of the Purbeck stone, or Purbeck limestone, belonging to the Oolitic group. 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..

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

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

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

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..

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