Salisbury Plain was then still wooded, but 4,000 years later, during the earlier Neolithic, people built a causewayed enclosure at Robin Hood's Ball and long barrow tombs in the surrounding landscape. In approximately 3500 BC, a Stonehenge Cursus was built north of the site as the first farmers began to clear the trees and develop the area. A number of other previously overlooked stone or wooden structures and burial mounds may date as far back as 4000 BC. Charcoal from the ‘Blick Mead' camp from Stonehenge (near the Vespasian's Camp site) has been dated to 4000 BC. The University of Buckingham's Humanities Research Institute believes that the community who built Stonehenge lived here over a period of several millennia, making it potentially one of the pivotal places in the history of the Stonehenge landscape.