Oil-producing rock Crossword Clue
5 letters · New York Times · Monday, August 28, 2017 · 41-Down
Appeared in 2 New York Times Crosswords between October 2012 and August 2017.
Exact puzzle match · New York Times · August 28, 2017 · 41-Down · 5 letters
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What does this clue mean?
a sedimentary rock formed by the deposition of successive layers of clay
noun
WordNet® (Princeton University)
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