greywacke
US graywacke
/ (ˈɡreɪˌwækə) /
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noun
any dark sandstone or grit having a matrix of clay minerals
QUIZ
THINGAMABOB OR THINGUMMY: CAN YOU DISTINGUISH BETWEEN THE US AND UK TERMS IN THIS QUIZ?
Do you know the difference between everyday US and UK terminology? Test yourself with this quiz on words that differ across the Atlantic.
Question 1 of 7
In the UK, COTTON CANDY is more commonly known as…
Word Origin for greywacke
C19: partial translation of German Grauwacke; see wacke
Words nearby greywacke
grey sedge, grey squirrel, grey-state, Grey-Thompson, grey vote, greywacke, grey warbler, grey water, grey-wave, greywether, grey whale
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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How to use greywacke in a sentence
In Cornwall and Devonshire, the lead ore is found in veins in killas, a clay-slate passing into greywacke.
A Dictionary of Arts, Manufactures and Mines|Andrew UreThe date assigned to its upheaval is "after the unfossiliferous greywacke, or Cambrian strata, and before the Silurian."
Principles of Geology|Charles LyellThis fossil-bearing set of strata he first styled the “fossiliferous greywacke series,” changing it in 1835 to “Silurian system.”