In the demesne at Eyrecourt, County Galway, one such marking on the 1944 to 1945 revision of the six-inch OS map turned out, when someone finally went to look in 1984, to be a disused gravel pit. It sits in meadowland, its outline now defined less by cartographic convention than by a dense tangle of trees and briars that have colonised the depression over the decades since it was last worked.