The late pre-Roman Iron Age (100 BC to AD 43) saw a conspicuous reconfiguration of the settlement and economic geography of Sussex, of which one aspect was the disappearance of hill-forts from the South Downs (except Devil's Dyke) and the establishment of hill-forts in the High Weald, including one in Ashdown Forest at Garden Hill (see below). Three other hill-forts lie in close proximity at Philpots, Saxonbury and Dry Hill. The general consensus is that these hill-forts are associated with a more intensive exploitation of the iron resources of the Weald. This period also presents the first evidence for centralised ceramic production, with specialist pottery sites identified at Chelwood Gate and Horsted Keynes, both situated close to the Forest and ideally located to exploit the local potting clays. Elsewhere in Ashdown Forest there is evidence of Iron Age enclosures at Gills Lap, marked by a roundel of fir trees, and King's Standing, both situated on high hilltops. Another site, at Chelwood Gate, known as Danes Graves, shows evidence of late pre-Roman Iron Age iron working.