Svecokarelian Orogeny (Sve''-co-ka-re'-li-an). The Proterozoic orogeny that formed the Svecofennian and Karelian formations, consisting of metamorphosed and folded sedimentary and volcanic rocks, which cover most of Sweden and Finland.
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.
Lycophytina (Ly-co-phy-ti'-na). A clade containing the lycophytes and the zosterophylls.
moment map . A stratigraphic map that expresses the positional relations of beds as a continuous variable (Krumbein and Libby, 1957, p.200); e.g. a center-of-gravity map and a standard-deviation map.
wash [eco geol] . An alluvial placer.
fanhead (fan'-head). The area on an alluvial fan close to its apex. Cf: fan bay.
rock mass . A term, used especially for engineering purposes, that includes a volume of earth material, including rock, soil, water, and air-filled voids, and the discontinuities that divide it (Bell, 1992, p.54). The behavior of a rock mass is determined, to a large extent, by the type, spacing, orientation, and characteristics of the discontinuities present.
zýkaite (zy'-ka-ite). A grayish-white orthorhombic mineral: Fe3+4(AsO4)3(SO4)(OH)•15H2O .
coastal current . Drift of water roughly parallel to the shore and outside the surf zone, whatever the cause.
nongeniculate coniform element . A coniform conodont element in which there is a smooth transition from posterior cusp margin to upper basal edge; in lateral view, posterior margin and upper basal edge form a straight or smoothly arcuate line (TIP, 1981, pt. W, supp.2).
river end . The lowest point of a river with no outlet to the sea, situated where its water disappears by percolation or evaporation (Swayne, 1956, p.121).
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