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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.
Also, caprock.
Origin
1865-1870
1865-70, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for caprock

cap rock

noun
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
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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