What is another word for cap rock?
Pronunciation: [kˈap ɹˈɒk] (IPA) 
Cap rock is a geological term used to describe a hard, resistant layer of rock that rests on top of softer rock layers. This layer of rock is typically found in areas where erosion has occurred and has acted to protect the underlying layer of rock from weathering. Synonyms for the term "cap rock" include protective layer, surface layer, weather-resistant rock, and erosion-resistant layer. Other terms that can be used interchangeably with cap rock are rock cap, capstone, and lid rock. Regardless of the term used, cap rock is an important geological formation that plays a critical role in protecting underlying rock layers from erosion and weathering.
