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Alternative forms[edit]


cap +‎ rock


caprock (countable and uncountable, plural caprocks)

  1. (geology) A harder or more resistant rock type overlying a weaker or less resistant rock type.
    • 2009 September 3, James Glanz, “Energy Company Calls Halt to Drilling Project”, in New York Times[1]:
      Last month, federal scientists said that the company had fallen far behind schedule because a huge rig hired to drill down about 12,000 feet, or more than two miles, on federal land had not been able to pierce surface formations called caprock.
    • 2013, Philipp Meyer, The Son, Simon & Schuster 2014, p. 424:
      Meanwhile, there were houses going up within gunshot of the caprock.