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Long Crags, Housey Crags, Langlee Crags and Tathey Crags, and Cunyan Crags are prominent isolated rock outcrops situated to the east and south of Hedgehope Hill and Cheviot. They were formed by metamorphic changes to the volcanic lavas caused by the eruption of a mass of molten rock from the Cheviot and Hedgehope volcanoes some 400 million years ago. This eventually cooled to form the granite which comprises the central part of the Cheviot massive. This part is today typically covered by heather within a surrounding area of andesite larvas. The circle of harder andesite rocks around Hedgehope and Cheviot make up a 'metamorphic aureole' which provided more resistance to natural weathering than the surrounding softer unchanged rocks leaving rocky 'tors' that were later sculptured by ice.

Great & Little Standrop and other rocky tors to the west of Cheviot which are composed of granite may have similar origin to those of other granite areas of the UK.

Northumberland National Park Geodiversity Audit & Action Plan: Link