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1. Oxford Dictionary

   greywacke

   • IPA[ˈɡreɪwakə]

   英式

   • n.
     a dark coarse-grained sandstone containing more than 15 per cent clay

   • noun: greywacke, plural noun: greywackes

2. • 釋義

   n.

   名詞

   • 1. a dark coarse-grained sandstone containing more than 15 per cent clay a 120-foot pyramid of battered greywacke a quarter mile offshore the shales and greywackes of the Skiddaw Group