Crossword Genius

Oil-bearing rock (5)

Ross

I believe the answer is:

shale

'oil-bearing rock' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for shale that I've seen before include "Stratified rock" , "Stone that splits easily into fine pieces" , "Soft sedimentary rock" , "Type of soft rock" , "Easily split layered rock" .)

I've seen this clue in the Newsday.
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