It is a subcircular depression, sitting quietly in a field, filled with stones that farmers cleared from the surrounding land over generations.

The story of this place is really the story of a cartographic mystery that took decades to resolve. The Ordnance Survey's 1945 revision of their six-inch map recorded the spot using hachures, the fine lines surveyors use to indicate a raised or hollowed feature in the landscape, suggesting something worth noting. When the site was actually inspected in 1984, the depression turned out to be a likely disused sand or gravel pit, the kind of modest extraction hollow that would have supplied local building or land-drainage needs in the post-1700 period. At some point after it fell out of use, the pit became a convenient dumping ground for field-clearance stones, the rounded or broken rocks that accumulate as farmers work the soil and need somewhere to put what the ground keeps throwing up. The result is an earthwork that looks, from a distance or on paper, as though it might be something older and more significant.