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cap rock
or caprock
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.
cap rock
noun
- 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
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Word History and Origins
Origin of cap rock1
An Americanism dating back to 1865–70
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Example Sentences
By the time Wadley reached the rough country of the cap-rock, the young day was beginning to awaken.
From Project Gutenberg
But when he saw yore son strike straight across country to the cap-rock, he trailed him to see where he was goin'.
From Project Gutenberg
Overstreet could do as he pleased, but he intended to slap a saddle on his horse and make tracks for the cap-rock country.
From Project Gutenberg
The discussion renewed itself as soon as the outlaws had hidden themselves in a pocket of the cap-rock.
From Project Gutenberg
The most common porous (containing) rock is sandstone, and the most common cap rock is shale.
From Project Gutenberg
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