Crossword Genius

Fossil rock (5)

Ross

I believe the answer is:

shale

(Other definitions for shale that I've seen before include "Fine pieces of stone on leash" , "Type of soft rock" , "Sedimentary clay rock, which may contain oil" , "Soft rock; heals (anag.)" , "Stone that splits easily into fine pieces" .)

I've seen this clue in the King Feature Syndicate.
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