A quarry pit at Rathgorgin in County Galway earned one such mark on the 1933 edition of the OS six-inch map, giving it the visual language of an earthwork worth noting. When someone finally went to look in 1983, it turned out to be exactly what it appeared: a pit, dug into the ground, ordinary enough on its own terms.

The site dates to after 1700, which places it firmly in the period of post-medieval extraction and land use. Small quarries and pits of this era are scattered across the Irish countryside, dug to supply local farms and estates with stone, gravel, or lime, often opening and closing within a generation and leaving little documentary trace beyond the hollow itself. The gap of fifty years between the map being published and anyone checking what the marking actually represented is, in its own quiet way, rather telling about how landscape features accumulate official-looking gravity simply by appearing in print.