Enclosure, Crean (Smallcounty By.), Co. Limerick
Co. Limerick |
Enclosures
A circular enclosure roughly twenty metres across sits beneath improved pasture in the Smallcounty Barony of County Limerick, invisible to the naked eye for most of the year and absent from every historical Ordnance Survey map ever produced.
It exists, officially, as a cropmark, the kind of faint circular shadow that only becomes legible when dry summer conditions cause the grass or grain above a buried feature to grow differently from the surrounding field, revealing the ghost of a boundary that was last actively used perhaps a thousand or more years ago. Enclosures of this type are generally understood to be the remains of early medieval settlements, a circular bank and ditch defining a domestic or agricultural space, though without excavation the precise function and date of any individual example remain open questions.
This particular site came to light not through any planned archaeological survey but as a byproduct of infrastructure work. An aerial photograph taken on 3 November 1984, part of a 1:5000 series flown for Bórd Gáis Éireann in connection with the Curraghleigh to Limerick gas pipeline, captured the enclosure as a clearly defined circular cropmark. The pipeline survey was looking at the ground for engineering reasons, not historical ones, yet the photograph preserved a record of something that Ordnance Survey mappers had never noted. Decades later, the site remained visible on Ordnance Survey Ireland orthophotos taken between 2006 and 2012, and on Google Earth imagery from the same period. The record was formally compiled by Martin Fitzpatrick and uploaded to the national sites database in March 2021. Two other enclosures are recorded nearby, one approximately 165 metres to the east and another around 155 metres to the north, suggesting this part of Limerick was more densely settled in the early medieval period than the current open pasture would lead anyone to suspect.
There is nothing to see on the ground. The site lies within improved agricultural pasture, and without the benefit of aerial imagery taken under the right conditions, the enclosure is indistinguishable from the surrounding field. The cropmark phenomenon works best during dry spells in late spring or summer, when differential soil moisture above a buried ditch causes the vegetation to respond in a way that becomes readable from above. For anyone researching the area, the OSi orthophotos from the 2006 to 2012 period and the associated Google Earth images referenced in the site record are the most useful starting point, since the feature has no surface expression to guide a visit.