Panhole
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A panhole or weathering pit is a depression or basin eroded into flat or gently sloping cohesive rock. Similar terms for this feature are gnamma or rock holes, armchair hollows, weathering pans and so
Panholes on a granite surface near Corscia, Corsica
Weathering pits on the "Cup and Saucer Rock" at Carn Brea.
Panholes in granodiorite at Glacier Point, Yosemite National Park, California
Rock hole in Hiltaba Nature Reserve, South Australia
Tor (rock formation)
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A tor, which is also known by geomorphologists as either a castle koppie or kopje, is a large, free-standing rock outcrop that rises abruptly from the surrounding smooth and gentle slopes of a rounded
Panhole
…climatic conditions. To ascertain the rate of weathering of the pits the rate of weathering of the surrounding rock surface must be controlled. For granite tors in the Cairngorms, one study estimated this to be 4.1 ± 0.2 mm/1000 years. In Australia, the terms "gnamma" and "rock hole" (or "rockhole") are used…
A tor in Altai Krai, southern Siberia
Kit-Mikayi, a celebrated tor near Kisumu, Kenya
Tor near the summit of Knocknagun, in Wicklow, Ireland
Roc Cornut, a celebrated granite tor, next to the D619 road in the commune of Campoussy, Pyrénées-Orientales, France.