Cissbury Ring is a biological Site of Special Scientific Interest north of Worthing in West Sussex. It is owned by the National Trust and is designated a Scheduled monument for its Neolithicflint mine and Iron Agehillfort. Cissbury Ring is the largest hill fort in Sussex, the second largest in England and one of the largest in Europe overall, covering some 60 acres. The earthworks that form the fortifications were built around the beginning of the Middle Iron-Age possibly around 250 BC but abandoned in the period 50 BC - 50 AD. The site of the fort contains a Neolithic mine, one of the first flint mines in Britain. Around 200 shafts were dug into Cissbury hill over around 900 years of use. Shafts were up to deep with diameters at the surface. Up to eight galleries extended outwards from the bottoms of the shafts, often interconnecting with one another. The site has been damaged by illicit metal detecting.
Structure
The ditches and banks are the remains of a defensive wall that enclosed of land; the inner band of the wall is over a mile around. The ditches are said to be as deep as three metres and were filled with loosened chalk and covered with timber palisade. The 600 foot hill is open to the public. From the top, one is able to see to the westSelsey, Chichester Cathedral, the Spinnaker Tower and the Isle of Wight. To the east, one is able to see Brighton, the Seven Sisters and Beachy Head. Cissbury Ring is the highest point in the borough of Worthing.
Once taken to mean Caesar's fort or Cissa's fort, both theories of Cissbury's meaning have been discounted. In the early eleventh century in the reign of Ethelred the Unready, Cissbury was known as 'Sithesteburh', which is taken to mean the 'last or the latest fort'. This may mean that Cissbury was the last fort to be refortified, after another nearby fort such as that at Burpham. It seems that the name Cissbury was altered to accommodate the legend that the fort was linked to Cissa the South Saxon.
Flint mines
Long before the hill was fortified, flint mines were being excavated in the area. Some shafts went down as far as. The shafts at Cissbury were excavated with antler picks, much like those at Grimes Graves and elsewhere. Flint was the common material for making stone axes for felling timber and working wood during the neolithic period. The site was one of the first Neolithic flint mines in Britain and it was exploited throughout the period. It is part of a group of flint mines in Sussex which followed a rich seam of flint-bearing chalk. Other examples include Grimes Graves in Norfolk, and Harrow Hill nearby. Cissbury was one of several important mining industries in the UK during the Neolithic and is thought to have been used into the Bronze Age, and later the Iron Age though flint mining probably stopped during the late neolithic, but there is some evidence of re-use of flint for tools during later times. Axes and Blades account for most of the tools produced at Cissbury and examples of Cissbury flint can be found as far as Italy. Axes were produced on site, as rough-outs, these were then traded or used off site. Many other types of stone were in demand for stone axes such as the greenstone of the Langdale axe industry in the Lake District. The axes were essential for forest clearance for farming in the Neolithic period, and found many other uses, such as wood working. Around 200 shafts were dug into the Cissbury hill over around 900 years of use. Shafts were up to deep with diameters at the surface. Up to eight galleries extended outwards from the bottoms of the shafts, often interconnecting with one another. Excavation of the mine shafts by John Pull in the 1950s uncovered the remains of a young woman who had been apparently killed in a tunnel collapse around 2000 BC. Charcoal possibly from her torch and a miniature whale carved from chalk were with her. The possibility that the shaft was used for a ritual burial has also been suggested however. The remains of two other people, a man and a woman, were recovered from different shafts at Cissbury in the nineteenth century and it has been suggested that the exhausted mines had a secondary purpose for formal burial. Alternatively, it may have been expedient to send women into the mines as they could squeeze into the narrow galleries and some archaeologists have suggested that flint extraction was a rite of passage for the more slightly-built juvenile members of Neolithic societies. The site is significant as it represents the switch from open cast flint extraction favoured previously by prehistoric peoples who exploited deposits of flint close to the surface, to deep shaft mining which required more effort but produced more flint of a higher quality.
Biology
The site has unimproved chalk grassland, scrub and neutral grassland. Upright brome is dominant in the chalk grassland, while common grasses in the neutral grassland include Yorkshire fog, sheep's fescue and creeping bent. The scrub areas provide important habitats for birds and butterflies.