[muhd-stohn] /ˈmʌdˌstoʊn/

noun, Geology.
a clayey rock with the texture and composition of shale but little or no lamination.
a dark grey clay rock similar to shale but with the lamination less well developed
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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