Froggatt Edge tors 1

Rock tors of cross-bedded Chatsworth Grit just set back a few metres from the cliff face of Froggatt Edge in the Peak District National Park.

These tors were formed as a result of periglacial weathering during the last glacial period - the Devensian - when the Peak District was largely free of ice, but still subject to intense cold permafrost conditions. The mushroom shape is probably a result of wind erosion - ground-hugging sand-blasting winds during this cold period.