Castle Lime Works Quarry

Castle Lime Works Quarry is a 1.6 ha geological Site of Special Scientific Interest near South Mimms in Hertfordshire. The site was notified in 1986 under the Wildlife and Countryside Act 1981. The site is a disused chalk quarry and according to Natural England:
 * This reveals extensive piping in the top of the chalk resulting from solution at the Chalk - Tertiary sediment interface. Believed to have formed during the Tertiary and Pleistocene, it is the finest exposure of clay-filled pipes in the Chalk Karst of England.

The site is on private land and there is no public access.