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Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..

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..

Dyke :: Dyke (n.) See Dike. The spelling dyke is restricted by some to the geological meaning.

Bovey Coal :: Bovey coal () A kind of mineral coal, or brown lignite, burning with a weak flame, and generally a disagreeable odor; -- found at Bovey Tracey, Devonshire, England. It is of geological age of the oolite, and not of the true coal era..

Vulcanic :: Vulcanic (a.) Of or pertaining to volcanoes; specifically, relating to the geological theory of the Vulcanists, or Plutonists..

Diluvialist :: Diluvialist (n.) One who explains geological phenomena by the Noachian deluge.

Catastrophism :: Catastrophism (n.) The doctrine that the geological changes in the earth's crust have been caused by the sudden action of violent physical causes; -- opposed to the doctrine of uniformism.

Archaean :: Archaean (a.) Ancient; pertaining to the earliest period in geological history.

Period :: Period (n.) One of the great divisions of geological time; as, the Tertiary period; the Glacial period. See the Chart of Geology..

Reconnaissance :: Reconnaissance (n.) An examination or survey of a region in reference to its general geological character.

Cataclysmist :: Cataclysmist (n.) One who believes that the most important geological phenomena have been produced by cataclysms.

Fresh-water :: Fresh-water (a.) Of, pertaining to, or living in, water not salt; as, fresh-water geological deposits; a fresh-water fish; fresh-water mussels..

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

Araucarian :: Araucarian (a.) Relating to, or of the nature of, the Araucaria. The earliest conifers in geological history were mostly Araucarian..

Geologically :: Geologically (adv.) In a geological manner.

Basset :: Basset (n.) The edge of a geological stratum at the surface of the ground; the outcrop.

Uniformitarian :: Uniformitarian (a.) Of, pertaining to, or designating, the view or doctrine that existing causes, acting in the same manner and with essentially the same intensity as at the present time, are sufficient to account for all geological changes..

Thin :: Thin (v. i.) To grow or become thin; -- used with some adverbs, as out, away, etc.; as, geological strata thin out, i. e., gradually diminish in thickness until they disappear..

Geognostical :: Geognostical (a.) Of or pertaining to geognosy, or to a knowledge of the structure of the earth; geological..

Geology :: 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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