Mudstone meaning

mŭd'stōn'
A fine-grained, dark gray sedimentary rock, formed from silt and clay and similar to shale but without laminations.
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A fine-grained sedimentary rock that is formed from silt and clay, similar to shale but not distinctly laminated.
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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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A fine-grained sedimentary rock whose original constituents were clays or muds.
noun
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