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.
Also, caprock.

1865–70, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cap rock
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
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.
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