graywacke definition

  • noun:
    • any one of different dark gray sandstones that have shale.
    • Alternative as a type of greywacke.
    • A conglomerate or grit stone, composed of curved pebbles and sand firmly united together.
    • In geology, a concise aggregate of curved or subangular grains of various silicious rocks, held collectively by a paste that is generally silicious.

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  • Definition for "graywacke"
    • any one of different dark gray sandstones that…
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