Hachures, the short radiating lines cartographers used to indicate slope or disturbed ground, can signal earthworks, quarries, or features of archaeological interest. For decades, this one sat on the map as an unresolved question in undulating pastureland.

When the site was inspected in 1984, the answer turned out to be straightforward, if a little deflating: a gravel pit, bisected by a road running north-north-west to south-south-east. The field to the east of that road had been ploughed in the intervening years, and whatever depression or surface trace had once existed had been reduced to little more than a shallow dip in the ground. The 1930 map had preserved a memory of something that the land itself had nearly forgotten.