graywacke

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gray·wacke

(grā′wăk′, -wăk′ə)

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).]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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of crushed graywacke hipped to om the It is made rock called aggregate, sh Bahrain fro Quarry.

Quarry helps to keep Silverstone on track

e of crushed graywacke hipped to m the It is made rock called g aggregate, sh Bahrain fro Quarry.

Quarry helps to keep Silverstone on track

The main gold vein prospect on the property occurs as low-sulfide, mesothermal quartz veins within Nicola Group siltstone and graywacke. One steeply-dipping vein exposed by a series of short trenches is at least 90 m long, strikes east-northeast, is typically 1.5 m wide and reaches a width of 2.5 m.

Canarc Reviews Results of Airborne Magnetic Survey Flown Over the Princeton Property in British Columbia

The surface of the track is made from Graywacke aggregate, shipped to Abu Dhabi from Bayston Hill quarry in Shropshire, England.

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Wacke, Graywacke and Matrix--What Approach to Immature Sandstone Classification?

Reservoir Characterisation of Lower Cretaceous Clastic Succession of Nizampur Basin, Eastern Tethys; Pakistan

(1970): Interpreting detrital modes of graywacke and arkose.

Composition of clastic sediments in the somosaguas area (middle Miocene, Madrid Basin): insights into provenance and palaeoclimate