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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.
Origin of cap rock
1865-70, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for cap-rock
Historical Examples
  • The discussion renewed itself as soon as the outlaws had hidden themselves in a pocket of the cap-rock.

    Oh, You Tex! William Macleod Raine
  • Let's light out for the cap-rock an' hole up for a coupla days.

    Oh, You Tex! William Macleod Raine
  • Overstreet could do as he pleased, but he intended to slap a saddle on his horse and make tracks for the cap-rock country.

    Oh, You Tex! William Macleod Raine
  • By the time Wadley reached the rough country of the cap-rock, the young day was beginning to awaken.

    Oh, You Tex! William Macleod Raine
  • But when he saw yore son strike straight across country to the cap-rock, he trailed him to see where he was goin'.

    Oh, You Tex! William Macleod Raine
British Dictionary definitions for cap-rock

cap rock

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
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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