siltstone

noun
silt·​stone | \ ˈsilt-ˌstōn How to pronounce siltstone (audio) \

Definition of siltstone

: a rock composed chiefly of silt hardened by heat, pressure, or cementation

First Known Use of siltstone

circa 1920, in the meaning defined above

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The first known use of siltstone was circa 1920

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