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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tungstibite . A green orthorhombic mineral: Sb2WO6.

micaceous iron ore . A soft, unctuous variety of hematite having a foliated structure resembling that of mica.

CI . (a) crystallization index. (b) contour interval.

Shidertinian (Shi-der-tin'-i-an). European stage: Upper Cambrian (above Tuorian, below Tremadocian).

phosphide (phos'-phide). A mineral compound that is a combination of phosphorus with a metal. An example is schreibersite, (Fe,Ni)3P.

beach ridge . A low, essentially continuous mound of beach or beach-and-dune material (sand, gravel, shingle) on the backshore of a beach beyond the present limit of storm waves or the reach of ordinary tides, and occurring singly or as one of a series of approximately parallel deposits. The ridges are roughly parallel to the shoreline and represent successive positions of an advancing shoreline. Syn: full. Cf: apposition beach.

slingram . A frequency-domain electromagnetic method in which coplanar (usually horizontal) transmitter and receiver coils separated by a constant distance are moved over a survey area. The primary field is nulled and in-phase and quadrature components are measured. Swedish for horizontal-loop method.

soft water . Water that lathers readily with ordinary soap; water containing not more than 60 mg/l of hardness-forming constituents expressed as CaCO3 equivalent. Cf: hard water; hardness [water].

flowtill (flow'-till). A superglacial till that is modified and transported by plastic mass flow (Hartshorn, 1958, p.481).

flowtill (flow'-till). A superglacial till that is modified and transported by plastic mass flow (Hartshorn, 1958, p.481).