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cap rock

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Definition of cap rock in English:

noun

[mass noun]
A layer of hard impervious rock overlying and often sealing in a deposit of oil, gas, or coal.
Example sentences
  • In some instances the alteration is so intense that all that remains of the host is a porous siliceous cap rock.
  • The cap rock of some domes contains economic concentrations of sulfur that are extracted as a melt by the Frasch Process.
  • Both species occur in the uppermost cap rock layer of the Upper Albian Boracho Formation northeast of Ft. Stockton, Pecos County, Texas.

Definition of cap rock in:

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