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Definitions
A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.
Used in a sentence
“Endless bleak, rounded hills composed of shales and ribs of tough ‘greywackes’ make up the Southern Uplands – all of such rocks were originally deposited under marine conditions.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer0 curated clues
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