Eachtra Journal

ISSN 2009-2237

Geophysical Survey - N7 Castletown-Nenagh Road Scheme

August, 2011 · Written by: Eachtra Print This Page This entry is part 28 of 33 in the Issue 11

A series of geophysical surveys commissioned by Eachtra Archaeological Projects was conducted at 5 sites outside the C.P.O. boundary of the new N7 Castletown to Nenagh road scheme.  The survey areas were located adjacent to significant archaeological remains that were excavated within the C.P.O. boundary of the road scheme.

A combination of fluxgate gradiometer and magnetic susceptibility surveys were undertaken on the selected sites. The fluxgate gradiometer surveys were undertaken at a sampling resolution of 1 x 0.25 m and magnetic susceptibility survey at a 5 x 5m sampling resolution.

The bedrock geology along the scheme consists of a mixture of greywacke, siltstone, sandstone and mudstone all of which are suitable for magnetic surveys although very weak magnetic responses were noted across most sites. The majority of the survey areas was covered in short grass or cut crops at the time of survey.

A  number  of  ditches  were  detected  at  Busherstown  1  which  appear  to  represent  a continuation  of  the  archaeological  activity  revealed  during  the  excavation. An arcing enclosure ditch has been identified to the south of the excavation.

Three possible ditches were detected across the Drumbaun 2 survey area. These appear to represent a continuation of the possible medieval boundary identified on the northern edge of the excavation. A continuation of a possible prehistoric boundary was also identified. Two possible pits were also identified within the confines of the medieval boundary.

A number of possible ditches were detected at Drumroe 1 which have a direct relationship to the archaeological excavation results. The edge of the probable zone of archaeological activity was also established with the detection of an arcing enclosure ditch.

A continuation to the medieval oval-shaped enclosure ditch was identified at Killeisk 1.

The mapped components of the ditched enclosure, from both excavation and geophysics, measures  95  m  NW-SE  and  41  m  NE-SW,  enclosing  a  total  area  of  0.335  hectares. A continuation of parts of the droveway was also identified along with a number of other possible ditches and a relict field boundary.

A possible boundary ditch was identified at Park 1. The remains of a “finger-shaped” ditch, which could be interpreted as a cursus monument, were also identified on the western edge of the survey area.

Author: Earthsound Archaeological Geophysics

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