RFG 2018 Conference

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.

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euosmite (eu-os'-mite). A brownish-yellow resin, with a low oxygen content and a characteristic pleasant odor, found in brown coal.

miscellaneous area . A kind of land area in a soil survey having little or no soil and thus supporting little or no vegetation without major reclamation. Includes areas such as beaches, dumps, rock outcrop, and badlands. The term is used in defining map units.

Hesperian . The intermediate-aged system of rocks in the geologic stratigraphy of the planet Mars. Named after Hesperia Planum, a broad upland area of plains with numerous wrinkle ridges; the base of the ridged plains defines the base of the Hesperian system (Tanaka, 1986). See also: Amazonian; Noachian.

miarolithite (mi''-a-ro-lith'-ite). A chorismite having miarolitic cavities or remnants thereof; a variety of ophthalmite [meta]. Rarely used.

hair pyrites . (a) millerite. (b) Capillary pyrite.

body wave . A seismic wave that travels through the interior of the Earth, with a propagation mode that does not depend on any boundary surface. A body wave may be either longitudinal (a P wave ) or transverse (an S wave ).

tension (ten'-sion). A state of stress in which tensile stresses predominate; stress that tends to pull a body apart.

muck [mining] . n. Rock or ore broken in mining v. To remove broken rock or ore.

wind ripple [snow] . One of a series of centimeter-scale, wavelike formations on a snow surface, lying at right angles to the wind direction, and formed as snow grains are moved along by the wind.

velar structure . Any elongate elevated structure parallel to the free edge of the valve in straight-backed ostracodes, commonly developed as a frill (velum) or a velar ridge; if a carina is present, the velar structure lies ventral to it.


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