cap rock

cap rock

noun Geology.

  1. a mass of anhydrite, gypsum, or limestone immediately above the salt of a salt dome.
  2. an impervious stratum overlying an oil- or gas-bearing structure.


  1. a layer of rock that overlies a salt dome and consists of limestone, gypsum, etc
  2. a layer of relatively impervious rock overlying an oil- or gas-bearing rock

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