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mudstone

[ muhd-stohn ]

noun

, Geology.
  1. a clayey rock with the texture and composition of shale but little or no lamination.


mudstone

/ ˈmʌdˌstəʊn /

noun

  1. a dark grey clay rock similar to shale but with the lamination less well developed


mudstone

/ mŭdstōn′ /

  1. A fine-grained, dark gray sedimentary rock consisting primarily of compacted and hardened silt and clay, similar to shale but without laminations. The proportions of silt and clay in mudstone are approximately equal.


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Word History and Origins

Origin of mudstone1

First recorded in 1730–40; mud + stone

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mudspringermud stream