greywacke

(redirected from greywackes)

greywacke

(ˈɡreɪˌwækə) or

graywacke

n
(Geological Science) any dark sandstone or grit having a matrix of clay minerals
[C19: partial translation of German Grauwacke; see wacke]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
They are mostly represented by greywackes, siltstones and claystones.
Flysch-type deposits are of continental clastics, greywackes, shales of the Germav Fm, and reef complexes of the Sinan Fm deposited in the Paleocene.
The SGC sequence in this area is characterized by a monotonous centimetric to decimetric alternation of greywackes and slates with minor presence of sandstones and conglomerates.
2009), derived from the erosion of emerged greywackes. Old shear zones in the eastern part of the basin revived, causing downward movement of the Jelgava Depression and uplift of the shallow shelf areas (Ulst et al.
Rates and processes of mineral weathering in soils developed on greywackes and shales in the southern uplands of Scotland.
Deformation modulus of heavily jointed--sheared and blocky greywackes by pressuremeter tests: numerical, experimental and empirical assessments, Engineering Geology 101(3-4): 269-282.
There seemed to be some preferential selection of the finer grained and generally harder rocks amongst the greywacke cobbles; at least 42% of these greywackes were composed of quartz-cemented sandstones.
Unit, greywackes, mudstones, shales and siliceous rocks of the Late Devonian--Late Carboniferous age do predominate.
Flysch-type deposits are of continental clastics, greywackes, shales of the Germav formation, and reef complexes of the Sinan formation, all deposited during the Paleocene.