Crossword Genius

Layered rock (5)

Ross

I believe the answer is:

shale

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

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

I've seen this clue in The New York Times and the Penny Press.
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