Crossword Genius

Fine-grained sedimentary rock (5)

Ross

I believe the answer is:

shale

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fine-grained sedimentary rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for shale that I've seen before include "Oil-rich rock" , "Stone that splits easily into fine pieces" , "Layered sedimentary rock" , "Clayey rock" , "Type of soft rock" .)

I've seen this clue in the Sydney Morning Herald.
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