Rock of Gibraltar – Wikipedia

The Rock of Gibraltar is a monolithic promontory.The Main Ridge has a sharp crest with peaks over 400 m above sea level, formed by Early Jurassic limestones and dolomites. It is a deeply eroded and highly faulted limb of an overturned fold.The sedimentary strata composing the Rock of Gibraltar are overturned, with the oldest strata overlying the youngest strata.

: https://en.wikipedia.org/wiki/Rock_of_Gibraltar