Before revision: thumbnail| Circular panhole in Capitol Reef National Park A panhole is a depression or basin eroded into flat or gently sloping cohesive rock.Twidale, C.R., and Bourne, J.A., 2018.
After revision: thumbnail| Panholes on a granite surface near Corscia, Corsica A panhole is a depression or basin eroded into flat or gently sloping cohesive rock.Twidale, C.R., and Bourne, J.A., 2018.