At Knockdrin in County Westmeath, a depression in the ground that had gone unrecorded and was considered potentially significant turned out, on closer inspection, to be something far more prosaic: a quarry, dug after 1700 and unconnected to any prehistoric or early medieval activity.

The finding was set out in a report dated 11 March 2008, compiled by Frank Coyne and Caimin O'Brien. The earthwork, which had previously attracted attention as a possible archaeological site, was re-evaluated and identified as a post-1700 quarry, meaning it falls outside the period that Irish archaeological classification typically concerns itself with. It is a small but telling example of how landscape features can mislead, and how methodical field investigation quietly corrects the record. Quarrying for stone, lime, or gravel was common across Ireland from the eighteenth century onward, and the physical scars left behind can weather and grass over until they bear a passing resemblance to far older earthworks.