Some 4,500 years ago, people dug a series of deep, wide pits in the area near Durrington Walls in southern England. They were gemometrically arranged, forming a 2-kilometer (1.2-mile) wide circle that enclosed over three square kilometers (1.16 square miles).
Long mistaken for naturally occuring features, the circle of human-made shafts has now come to be understood as a colossal project that lends new dimensions to the Stonehenge landscape.
An invisible ring around Durrington Walls
Durrington Walls is just a stone’s throw from the small English town of Amesbury, and just three kilometers, or about half an hour on foot, from Stonehenge. Each pit or shaft is approximately 10 meters (32.8 feet) wide and 5 meters deep.
Of the 20 pits discovered so far, a new study suggests that at least 15 form a huge, even circle around the henge of Durrington Walls. A henge is a type of prehistoric earthwork consisting of a ring-shaped bank, fortified with an inward ditch, encircling a flat circular area.
They were likely used for ceremonial purposes, to congregate or perform rituals. At the center of Durrington Walls used to be a circular structure of wooden posts, driven deep into the ground and surrounded by a settlement.
The pits were discovered years ago, but the newest research is just now uncovering more details, and providing deeper understanding. Scientists have now been able to date the structure to about 2480 BCE using optically stimulated luminescence (OSL).
The OSL method is a fairly precise way of pinpointing a sediment’s last exposure to light — and by extension, the last time it was covered or buried — by measuring the natural radiation captured in certain minerals like quartz and feldspar. This technique relies heavily on the quality of the sample and has a margin of error of about 5-10%.
The recent study shows that the circular structure did not accidentally form over centuries, but was the result of intentional efforts in a planned, momunental project. The pits were actively used as part of the cultural landscape — and traces of humans, plants and animals indicate deliberate coordination.
A ‘sacred boundary’ mapped with astounding precision
None of the shafts examined can be attributed to natural erosion of the chalky landscape — the pits’ sheer size and number clearly suggest they were dug by humans. They form a near-perfect circle, and are spaced at even intervals. The width and distance of the pits follow a clear pattern.
This means that the humans involved were able to mark distances, count steps or measurements, and work out a coordinated plan — all before they started digging. And so, what at first glance seemed like an assortment of strange holes became a rare testament to the fact that numbers, measurements, and large-scale planning were already part of the daily lives of Neolithic people living in the area.