Resistivity

Date 19 March 2017

Event ID 1038952

Category Recording

Type Resistivity

Permalink http://canmore.org.uk/event/1038952

NR 2402 6721 (NR26NW 12) This project was designed to support the schools to undertake their own archaeological fieldwork on Islay. Each school ‘adopted’ a monument in their vicinity, with Jura children joining in with Keills Primary School on Islay. The children worked with a team of professional archaeologists to undertake site surveys. They were introduced to several archaeological recording techniques and were asked to think about the landscape, and how it might have changed over time. In May 2017 the schools held a joint exhibition in the Gaelic College, which championed the children’s achievements and creations, some

of which are featured on the Islay Heritage website (http://

islayheritage.org/schools-project/).

Carnduncan (Càrn Dhonnchaidh) cairn is a Bronze Age kerbed cairn overlooking Loch Gorm. At 17m in diameter it is one of the largest and the best preserved examples of this type on Islay. Because of its good preservation, and a possible association with the nearby Bronze Age settlement and field system at An Sidhean, Carnduncan cairn has been

designated as a scheduled monument (SM6247). On 19 March 2017 Port Charlotte Primary School pupils helped to carry out detailed topographic, photographic and electrical resistance survey of the site, thus updating the RCAHMS’s survey from the 1970s.

The results of the survey suggest that not all parts of the cairn were constructed in the same way, which could mean that there were multiple phases of construction and modification. A small hut or a shelter was inserted into the remains of the cairn at a later date. Although the resistivity

survey offers some clues about the composition of the cairn, this only relates to its uppermost layers. Being relatively well preserved and standing up to 1.5m high in relation to the surrounding ground, the cairn is too substantial for the lower levels to be reached by the method used. Alternative geophysical techniques with deeper penetration, such as

ground penetrating radar (GPR) and electrical resistance tomography (ERT) would be better suited alternatives for any future geophysical work on the monument.

Archive and report: NRHE

Funder: Ian Mactaggart Trust

Darko Maricevic, Alexandra Knox, Robert Fry, Sarah Lambert-Gates and Steven Mithen – Islay Heritage

(Source: DES, Volume 18)