Also the layers in the rock called bedding planes provide ledges that help the climber. In contrast other climbers prefer a smoother rock. Quentin Fisher is another climbing geologist. He prefers climbing on smooth limestone. It has very few handholds and requires very great physical strength and agility.
Limestone is quite soft and is often cut away by the action of water.
When this happens overhangs may occur. These are another attractive feature for serious climbers - sometimes requiring that they hang under the rock as they climb it. Features like these are important to Quentin who doesn't climb rocks to get to the top but to experience the challenge of moving across them. It a relationship to the rocks that's informed by a love of geology. Not all geological events happen over millions of years - some occur in the blink of an eye, geologically speaking.