Lower Dicker

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This article is about the SSSI near Lower Dicker. For the settlement of Lower Dicker, see Hellingly.
Lower Dicker
Site of Special Scientific Interest
Lower Dicker is located in East Sussex
Lower Dicker
Location within East Sussex
Area of Search East Sussex
Grid reference TQ557111
Coordinates 50°52′42″N 0°12′51″E / 50.878272°N 0.214157°E / 50.878272; 0.214157Coordinates: 50°52′42″N 0°12′51″E / 50.878272°N 0.214157°E / 50.878272; 0.214157
Interest Geological
Area 0.12 hectares
Notification 1998
Location map English Nature

Lower Dicker is a 0.12 hectare (0.23 acre) geological Site of Special Scientific Interest in East Sussex, England. The site was notified in 1998 under the Wildlife and Countryside Act 1981. The site is a small, overgrown quarry approximately four kilometres north-west of Hailsham.


Exposures of a sand member are present in the quarry. The sand is of the lower division of the Weald Clay. The sandstone units of the Weald Clay Group represent river deposits which periodically extended into the Wealden lake or lagoon. The sandstones are important as lithostratigraphical markers (units of rock with the same affinity) and are considered to reflect the effects of tectonic uplift in nearby areas feeding sediment into the area. The mineralogy of these sandstones reflects their provenance and they are therefore of great importance for understanding the changes which took place in the palaeogeography of the Weald.

Upper Dicker provides the most southerly exposure of any of the Weald Clay sand members in Britain. It is also important for marking the furthest known extension eastwards of Cornubian (what is today Devon and Cornwall) debris (pieces of rock incorporated into the sandstones and clays), indicating the presence of a river system extending out of south-west England at this time.


"SSSI Citation — Lower Dicker" (PDF). Natural England. Retrieved 2008-10-18.