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Castle Greg Electo-Magnetic Survey
Date 21 July 2022 - 22 July 2022
Event ID 1155326
Category Recording
Type Electromagnetic
Permalink http://canmore.org.uk/event/1155326
Historic Environment Scotland (HES), Heritage Recording and Archaeology Service (HeRAS) , undertook geophysical (electro-magnetic) survey at Castle Greg Roman fortlet, Camilty Plantation, West Lothian, Scotland. This project aimed to support the investigation into effective methods of integrating multiple datasets for recording earthwork and sub-surface archaeological remains, using geophysical, spectral, and topographic datasets.
Fieldwork, data processing, and interpretation were undertaken by Nick Hannon and Hazel Blake.
The electro-magnetic survey was conducted using a hand-held GF Instruments CMD Mini Explorer. This system employed a single transmitter coil and three receiver coils spaced at 0.32m, 0.71m, and 1.18m from the transmitter. The system was set in High (Horizontal Coplanar) configuration, so provided an estimated effective depth penetration of 0.25m, 0.5m, and 0.9m respectively. The system was carried at approximately 0.1m from the surface to the right-hand side of the operator. The survey was conducted by walking a series of parallel traverses, with traverses aligned northwest-southeast and positioned 0.5m apart. The geophysical survey produced good quality results which give a high level of confidence that the methodology and survey strategy was appropriate to assess the archaeological potential of the survey area.
The survey identified eight features within the fortlet, relating to the rampart core, possible buildings, and a potential oven set into the rampart.
The survey archive includes a survey report [1] and spatial data and layers created during data processing and interpretation. These include the unprocessed survey data [2], processed survey data, survey area extents that contain the survey metadata, along with polygon interpretations [3].
Visited by HES Archaeological Survey (NH and HB), between 21st and 22nd July 2022.
[1] http://canmore.org.uk/collection/2478985
[2] http://canmore.org.uk/collection/2708756
[3] http://canmore.org.uk/collection/2708759
