Search the Dictionary

ence 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 produc…

The part of geology relating to structure and organisms which require to be studied with a microscope.

Pertaining to, or resembling, an abyss; bottomless; unending; profound. Geology gives one the same abysmal extent of time that astronomy does of space. Carlyle.

an paleozoic time, and including the oldest American rocks known to be fossiliferous. See Geology. -- Acadian owl (Zoöl.), a small North American owl (Nyctule Acadica); the saw-whet.

the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.

by many geologists regarded as the beginning of the Silurian age, See the Diagram, under Geology.

coal) which make up the strata of the Carboniferous age or period. See the Diagram under Geology.

tains, and extend south and west under the Carboniferous formation. See the Diagram under Geology.

acteristic gritty sandstone marked with impressions of cauda galli. See the Diagram under Geology.

ls, and the Quaternary, or Age of man. [Written also cænozoic, cainozoic, kainozoic.] See Geology.

urian system; -- so named from a township in Clinton Co., New York. See the Diagram under Geology.

ll developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology.

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.

ormed in the Cretaceous period; -- called also the chalk formation. See the Diagram under Geology. -- Cretaceous period (Geol.), the time in the latter part of the Mesozoic age during which the Cretaceous formation was deposited.

ony portions of many large and remarkable fishes of extinct groups. See the Diagram under Geology.

Relating to physical forces, effects, or laws; as, dynamical geology. As natural science has become more dynamic, so has history. Prof. Shedd. Dynamical electricity. See under Electricity.

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

Of or pertaining to geology, or the science of the earth.

One versed in the science of geology.

To study geology or make geological investigations in the field; to discourse as a geologist. During midsummer geologized a little in Shropshire. Darwin.