mudstone

English

Etymology

From mud +‎ stone.

Noun

mudstone (plural mudstones)

  1. (petrology) A fine-grained sedimentary rock whose original constituents were clays or muds. [from 18th c.]
    • 2018, Susannah Lydon, The Guardian, 23 March:
      The new fossils come from mudstones in central Poland, in beds that have been dated using other, much more common and cosmopolitan, fossils.

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