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Graywacke   Listen
noun
Graywacke  n.  (Geol.) A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together. Note: This term, derived from the grauwacke of German miners, was formerly applied in geology to different grits and slates of the Silurian series; but it is now seldom used.






Collaborative International Dictionary of English 0.48







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