Sheepleas  Sheepleas is a biological and geological Site of Special Scientific Interest east of Guildford in Surrey. It is a Geological Conservation Review site and a Local Nature Reserve. It is owned by Surrey County Council and managed by the Surrey Wildlife Trust. This sloping site on the North Downs has woodland, scrub and botanically rich grassland. The diverse invertebrate fauna includes two nationally rare flies, "Norellia spinipes" and "Microdon devius". A cutting in Mountain Wood exposes a unique gravel Pleistocene deposit which throws light on the Quaternary history of the Weald and the evolution of the London Basin. The site is open to the public.