Graywacke

Gray"wacke`

(?), n. [G. grauwacke; grau gray + wacke wacke. See Gray, and Wacke, and cf. Grauwacke.] (Geol.) A conglomerate or grit rock, consisting of rounded pebbles and sand firmly united together.
[1913 Webster]

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.
[1913 Webster]

 

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Tue 11th December 2018