Alternative formsEdit

  • cap rock


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”, New York Times:
      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.
Last modified on 24 August 2013, at 10:56