grey wacke

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greywacke — [ greɪwakə] (US graywacke) noun Geology a dark coarse grained sandstone containing more than 15 per cent clay. Origin C18 (as grauwacke): from Ger. Grauwacke, from grau grey + wacke … English new terms dictionary
Sedimentary rock — Middle Triassic marginal marine sequence of siltstones (below) and limestones (above), Virgin Formation, southwestern Utah, USA Sedimentary rock are types of rock that are formed by the deposition of material at the Earth s surface and within… … Wikipedia
Geology of Tasmania — Tasmania has a varied geological history, with the world s biggest exposure of diabase, or dolerite. Rocks from the Neoproterozoic, Paleozoic and Mesozoic time periods appear. It is one of the few southern hemisphere areas glaciated during the… … Wikipedia
greywacke — n. (Geology) coarse grained wacke of dark grey color … English contemporary dictionary
greywackes — n. (Geology) coarse grained wacke of dark grey color … English contemporary dictionary
greywacke — n. (US graywacke) Geol. a dark and coarse grained sandstone, usu. with an admixture of clay. Etymology: Anglicized f. G Grauwacke f. grau grey: see WACKE … Useful english dictionary

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