Definitions for: Graywacke

Webster (1913) Definition: 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
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.

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