noun

mudstone

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Mudstone (noun) means a sedimentary rock with very small grains, originally formed from clay or mud.

noun

A sedimentary rock with very small grains, originally formed from clay or mud.

"Excavation of the twin bore tunnel will produce around 500,000 tonnes of mudstone and soil, which will be processed on site and then reused to build embankments elsewhere along the route." — Paul Stephen, HS2's Dorothy starts to dig second tunnel bore (2022)

"The new fossils come from mudstones in central Poland, in beds that have been dated using other, much more common and cosmopolitan, fossils." — Susannah Lydon, The Guardian (2018)

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