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:
1865–70, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cap rock
 
n
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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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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