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greywacke

/ ˈɡreɪˌwækə /

noun

  1. any dark sandstone or grit having a matrix of clay minerals
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of greywacke1

C19: partial translation of German Grauwacke; see wacke
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Example Sentences

In Cornwall and Devonshire, the lead ore is found in veins in killas, a clay-slate passing into greywacke.

The date assigned to its upheaval is "after the unfossiliferous greywacke, or Cambrian strata, and before the Silurian."

This fossil-bearing set of strata he first styled the “fossiliferous greywacke series,” changing it in 1835 to “Silurian system.”

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