cap rock
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Related to cap rock: reservoir rock, source rock
cap rock
n
1. (Geological Science) a layer of rock that overlies a salt dome and consists of limestone, gypsum, etc
2. (Geological Science) a layer of relatively impervious rock overlying an oil- or gas-bearing rock
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cap′ rock`
or cap′rock`,
n.
a mass of anhydrite, gypsum, or limestone immediately above the salt of a salt dome.
[1865–70, Amer.]
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