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cap rock

noun, Geology
a mass of anhydrite, gypsum, or limestone immediately above the salt of a salt dome.
an impervious stratum overlying an oil- or gas-bearing structure.
Origin of cap rock
1865-70, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for cap rock
  • Dolomite is what has created this waterfall and it is also the cap rock for our more famous and durable hoodoos.
  • cap rock has all the characteristics of a petroleum reservoir and often contains hydrocarbons.
  • At the base of the cap rock an inflection point occurs in the temperature profile.
British Dictionary definitions for cap rock

cap rock

a layer of rock that overlies a salt dome and consists of limestone, gypsum, etc
a layer of relatively impervious rock overlying an oil- or gas-bearing rock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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