ROMAN FORT ENVIRONS GEOPHYSICAL SURVEY AT TRAWSCOED ROMAN FORT AND ERGLODD FORTLET
Cambria Archaeology, Ymddiriedolaeth Archaeolegol Gwynedd Gwynedd Archaeological Trust, March (2007)
The Gwynedd Archaeological Trust was contracted to carry out fluxgate gradiometer surveys at Trawscoed and Erglodd Roman forts by Cambria Archaeology (Dyfed Archaeological Trust). The survey formed part of a Cadw funded pan-Wales study examining aspects of Roman fort environs and Roman roads. Surveys had previously been carried out at several sites within Gwynedd, Powys and Dyfed and had produced good results. The methodology developed in these surveys was adopted in the present project.
Fluxgate gradiometer survey provides a relatively swift and completely non-invasive method of surveying large areas. Roman military sites are well suited to this technique as significant magnetic enhancement of the soil is an inevitable result of the day to day activities in a Roman fort. Recent surveys carried out in and around Roman forts in Gwynedd and Cumbria (Hopewell 2005 and Burnham 2001) have demonstrated the suitability of this approach. A wide range of features was detected both within and outside the forts. Most of the sites produced evidence for the presence of vici in the form of ribbon development along at least one of the roads leading from the fort.