Crossword Genius

Dark fine-grained sedimentary rock composed of layers of compressed clay, mud or silt (5)

Ross

I believe the answer is:

shale

(Other definitions for shale that I've seen before include "Fine pieces of stone on leash" , "Soft sedimentary rock" , "Clayey rock" , "Oil-bearing rock" , "Easily split layered rock" .)

I've seen this clue in The Mirror.
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