cap rock

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, cap·rock.


Origin:
1865–70, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cap rock is always a great word to know.
So is infiltration. Does it mean:
seepage of water into soil or rock
process where the surface of the earth is worn away by the action of water, glaciers, winds, waves
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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