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Mineral layer involved in fracking Crossword Clue

5 letters · New York Times · Monday, December 1, 2014 · 40-Across

Appeared in 1 New York Times Crossword: Monday, December 1, 2014.

Exact puzzle match · New York Times · December 1, 2014 · 40-Across · 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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