Monkton chalk pit
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Grid Reference: TQ560382
High Rocks is a key geomorphological site for sandstone weathering features developed on the highest cliffs of the Weald. The Ardingly Sandstone is gently cambered (deformed) and the joints have opened out to form spectacular Gulls (tension cracks) that are wide enough in places for a person to enter.
The sandstone surface develops a protective crust and displays a variety of micro-weathering features, notably honeycombing and polygonal cracking. The origin of this cracking is problematic but may relate to freezing and thawing under periglacial conditions during the Pleistocene.
Open gulls are comparatively rare in Britain, except in the central Weald. They, and the cracking features described above are nowhere better displayed than in the great extent of open passages at High Rocks.
For more information on this SSSI site visit the English Nature website.
(Regionally Important Geological Sites)
RIGS are geological sites that are important for historical, scientific research or educational reasons.
(Sites of Special Scientific Interest)
SSSIs give legal protection to the best sites for wildlife and geology in England.