cataphoresis (cat-a-pho'-re-sis). Electrophoresis in which the movement of suspended positive particles in a fluid is toward the cathode. Cf: anaphoresis.
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.
lecontite (le-cont'-ite). A colorless orthorhombic mineral found in bat guano: (NH4,K)Na(SO4)•2H2O .
Siegenian (Sie-gen'-i-an). A European stage: Lower Devonian (above Gedinnian, below Emsian).
stipe [bot] . The stalk of a pistil or other small organ when axile in origin; also, the petiole of a fern leaf (Lawrence, 1951, p.771). Adj: stipitate.
segregation banding . A compositional banding in gneisses that is not primary in origin, but rather is the result of segregation of material from an originally more nearly homogeneous rock (Billings, 1954). Cf: cleavage banding.
CIPW classification . A system for classifying and naming igneous rocks based on the CIPW norm. The initials represent the initial letters of the names of the men who devised the system in 1902, Cross, Iddings, Pirsson, and Washington. Syn: quantitative system; norm system.
surfusion (sur-fu'-sion). An obsolete term proposed by Fournet (1844) for a condition under which the fusing points of substances are lowered to temperatures much below the points at which they usually solidify (see Zittel, 1901, p.342).
point [surv] . (a) One of the 32 precisely marked equidistant spots about the circumference of a circular card attached to a compass, which indicate the direction in which the various parts of the horizon lie; e.g. a cardinal point. The term is also applied to the angular distance of 11.25 degrees between two such successive points, and to the part of the horizon indicated precisely or approximately by a point of a compass card. (b) A position on a reference system determined by a survey and represented by a fix; e.g. a "point of observation".
loessification (loess''-i-fi-ca'-tion). Formation and development of loess.
contouring . In the strictest sense, contouring is the construction of lines (contours) connecting points of equal elevation on a map representing topography. The term has been generalized to the presentation of any spatial property on a map by isolines that connect points of equal value, in order to represent the form of a real or imaginary surface.
Pages
