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caprock

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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:
1865–70, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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