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greywacke
(redirected from graywackes)

    Also found in: Encyclopedia 0.01 sec.
greywacke US, graywacke [ˈgreɪˌwækə]
n
(Earth Sciences / Geological Science) any dark sandstone or grit having a matrix of clay minerals
[partial translation of German Grauwacke; see wacke]
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Drilling started at D95-216 again this week and encountered the footwall graywackes at 785' and the hole was stopped.
Ramrod Mobilizes 2nd Rig at Damoti Lake by Business Wire
 
 
 
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