A hachured feature, the cartographer's shorthand of clustered lines used to suggest a depression or earthwork, has a way of implying significance, something worth noting, something that merits the ink. On the 1944 to 1945 revision of the Ordnance Survey six-inch map covering Longford townland in County Galway, one such marking sits amid what was then, and remains, agricultural land given over to tillage. It invited curiosity for decades.

When Olive Alcock visited the site in 1984, the mystery resolved itself quietly. The feature turned out to be a disused gravel pit, its outline softened by time into a shallow depression in the ground. No dramatic archaeology, no buried structure, just the faint trace of extraction work, a place where gravel was once dug out and carted away, leaving behind a modest hollow that the landscape has been gradually reclaiming ever since. Gravel pits of this kind were once scattered across rural Ireland, practical necessities for road-making and construction, worked and then abandoned when the material ran out or the need moved elsewhere.