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Crossword solution:

13 clues for "SHALE":

  1. Fine-grained rock
  2. Fissile rock
  3. Laminated rock
  4. Type of rock.
  5. ___ oil
  6. Oilbearing rock
  7. Oilproducing rock
  8. Petroleum source
  9. Porous rock.
  10. Rock
  11. Rock-made from layered mud
  12. Rock that's "fracked"
  13. Thinlayered rock