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Mudstone vs Rudstone - What's the difference?

mudstone | rudstone |

As nouns the difference between mudstone and rudstone

is that mudstone is (rock) a fine-grained sedimentary rock whose original constituents were clays or muds while rudstone is a calcareous rock consisting of coarse limestones supported by grains larger than two millimetres.

mudstone

English

Noun

(wikipedia mudstone) (en noun)
  • (rock) A fine-grained sedimentary rock whose original constituents were clays or muds.

    • rudstone

    English

    (Dunham classification)

    Noun

  • A calcareous rock consisting of coarse limestones supported by grains larger than two millimetres.