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graywacke
(redirected from Greywacke)

    Also found in: Encyclopedia, Wikipedia 0.06 sec.
gray·wacke  (grwk, -wk)
n.
Any of various dark gray sandstones that contain shale.
[Partial translation of German Grauwacke : grau, gray + Wacke, rock (from Middle High German, from Old High German waggo, boulder; see wegh- in Indo-European roots).]
graywacke  (grwk, -wk)
Any of various dark gray, coarse-grained sandstones that contain abundant feldspar and rock fragments and often have a clay-rich matrix. Graywackes are thought to originate in environments where erosion, transportation, and deposition happen so quickly that minerals and rock fragments do not have sufficient time to break down into finer constituents.


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The supracrustal (greenstone) belts are lithologically diverse and include basalt, greywacke, pelite, and iron formation, along with lesser andesite, dacite, rhyolite, ultramafic rocks, conglomerate, and carbonate rocks.
Government geoscience stimulates mineral exploration in the superior ... by Simard, Martin / Geoscience Canada
And beneath the Greywacke Arch, a street musician was playing plaintive standards on his alto saxophone, lending the sense of a Woody Allen soundtrack to the day.
LITTLE BITES OF THE BIG APPLE NEW YORK SIGHTS AND ACTIVITIES YOU ... by Daily News (Los Angeles, CA)
Suture zones are characterized by regionally extensive belts of greywacke flysch deposited early during the collisional process and subsequently deformed and metamorphosed during continued convergence.
PanLITHOPROBE workshop IV: IntraOrogen correlations and comparative ... by van Staal, C. / Geoscience Canada
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