coarse admixture . A term applied by Udden (1914) to an admixture (in a sediment of several size grades) whose particles are coarser than those of the dominant or maximum grade; material coarser than that found in the maximum histogram class.
GeoWord of the Day
The GeoWord of the Day is a free service of the American Geosciences Institute. All of the terms and definitions are from the Glossary of Geology, 5th Edition Revised.
mesogene (mes'-o-gene). Said of a mineral deposit or enrichment of mingled hypogene and supergene solutions; also, said of such solutions and environment.
tropical air mass . An air mass originating over oceans and continents between 30° north and 30° south of the Equator; characterized by warm air. Cf: polar air mass.
adaptation (ad-ap-ta'-tion). Modification, as the result of natural selection, of an organism or of its parts so that it becomes better fitted to exist under the conditions of its environment.
gilalite (gi'-la-lite). A green or blue-green monoclinic mineral: Cu5Si6O17•7H2O .
bench placer . A bench gravel that is mined as a placer. Syn: river-bar placer; terrace placer.
spitskop (spits'-kop). A term used in South Africa for a hill with a sharply pointed top. Etymol: Afrikaans. Cf: tafelkop.
polarograph (po-lar'-o-graph). An instrument for analyzing solutions by electrolysis using a cathode consisting of falling mercury drops. See also: polarography.
alpine karst . Karst formed at high altitude. Cf: glaciokarst; nival karst.
factor analysis (fac'-tor). The application of techniques that attribute the variation and interrelations observed within a set of multivariate observations to correlations between the observed variables and a smaller set of hypothetical variables or underlying "factors". The factors usually are considered to be uncorrelated and sometimes interpreted as being casual influences, although there is no mathematical basis such an interpretation. Cf: Q-mode factor analysis; R-mode factor analysis.
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