Visual Timeline: Stonehenge
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8500 BCE - 7650 BCE: Three large post holes and a tree hole close to Stonehenge show evidence of probable ritual activity on the site long before the appearance of the monument.
3700 BCE: Construction of the causwayed enclosure (a type of large prehistoric earthwork) known as Robin Hood's Ball, 2.8 miles north-west of Stonehenge.
3100 BCE: Stonehenge Phase I - earthen henge dug on the site.
3000 BCE: Stonehenge Phase II - Digging of the Aubrey Holes, which probably contained wooden posts (or perhaps bluestones). Stonehenge functions as a cremation cemetery.
2550 BCE: Phase III at Stonehenge, the refashioning of the simple earth and timber henge into a unique stone monument.
2030 BCE - 1520 BCE: The last phase of construction at Stonehenge, the digging of the Y and Z holes outside the outermost sarsen circle.