During the 7th millennium BC the sea level rose and flooded the valleys and
low lying ground surrounding Glastonbury so the Mesolithic people occupied
seasonal camps on the higher ground, indicated by scatters of flints. The
Neolithic people continued to exploit the reedswamps for their natural
resources and started to construct wooden trackways. These included the Sweet
Track, west of Glastonbury, which is one of the oldest engineered roads known
and was the oldest timber trackway discovered in Northern Europe, until the
2009 discovery of a 6,000 year-old trackway in Belmarsh Prison. Tree-ring
dating
