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What does graywacke mean?

Looking for the meaning or definition of the word graywacke? Here's what it means.

Noun
  1. Alternative form of greywacke
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Examples
Conglomerate clasts are principally volcanic rocks and greenish gray chert, with subordinate arkose, graywacke, siltstone, red chert, quartzite, white quartz, and limestone.
Mr. Hitchcock has nowhere maintained the existence of an ornithichnite in the graywacke of Hudson valley.
We're sure to get the better of graywacke, and why not anticipate?
Is it primitive, or is it graywacke like Catskill Mountains?

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