IPA: /ˈkæpˌrɒk/
KK: /ˈkæpˌrɑk/
A type of rock that is harder and more resistant than the rocks below it, often forming a protective layer.
The caprock prevented erosion of the softer layers beneath it.
Caprock is formed from "cap" (from Old French *cape*, meaning head or top) and "rock" (from Old English *rocc*, meaning stone). The term refers to a layer of rock that forms a protective cap over softer materials beneath it.
Think of a 'cap' as something that covers or protects, like a hat on your head, and 'rock' as the solid material underneath. This helps you remember that caprock is a layer of rock that protects what is below.