Barrow (Ditch barrow), Knocklong West, Co. Limerick

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Barrow (Ditch barrow), Knocklong West, Co. Limerick

In a field of reclaimed wet pasture in County Limerick, close to the townland boundary between Knocklong West and Doonmoon, there is a prehistoric burial mound that has never appeared on an Ordnance Survey historic map.

It was not discovered by excavation, or by any deliberate archaeological survey on the ground. It came to light because a gas pipeline was being planned, and someone looked carefully at an aerial photograph.

A ditch barrow is a type of funerary monument, typically a low circular mound surrounded by a cut ditch, raised in prehistoric Ireland as a place of burial or commemoration. The possible example recorded here, catalogued as LI040-145002-, was first identified during examination of aerial photographs taken on 3 November 1984 at a scale of 1:10,000 by Bórd Gáis Éireann as part of their gas pipeline survey work. What the photographs revealed was a circular cropmark, the kind of subtle surface patterning that appears in grass or crops when buried features below ground affect moisture retention differently from the surrounding soil. The mark measures approximately eight metres in diameter. Decades later, the monument was again visible, if only faintly, on Digital Globe orthoimagery captured between 2011 and 2013, and traces of it can still be detected on Google Earth. The record was compiled by Fiona Rooney and formally uploaded in June 2021.

The site sits roughly ten metres south of the townland boundary, in pasture that has been drained and improved over time, which is part of why it survives only as a shadow rather than as any visible earthwork. There is nothing to see from a road, and access to the field would require landowner permission. The cropmark itself is most legible in dry summers, when buried features tend to express themselves most clearly at the surface, and is best appreciated through the satellite imagery rather than on foot. For anyone interested in the archaeology of the Irish midlands and their margins, this kind of site is a useful reminder that the landscape holds far more than has been formally mapped, and that pipelines have, occasionally, led archaeologists somewhere unexpected.

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