cap rock Hear it!

cap rock definition

cap rock

a relatively impervious rock layer immediately overlying a deposit of oil, gas, salt, etc.

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.