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Castle Greg Gradiometer Survey
Date 21 July 2022 - 22 July 2022
Event ID 1155325
Category Recording
Type Magnetometry
Permalink http://canmore.org.uk/event/1155325
Historic Environment Scotland (HES), Heritage Recording and Archaeology Service (HeRAS), undertook a geophysical (gradiometer) 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 gradiometer survey was conducted using a Sensys MXPDA system mounted on a Sensys F-type non-magnetic frame. Due to the uneven ground conditions, the frame was suspended from the system’s battery harness and carried by the operator. This system utilised five Sensys FGM650/3 sensors operating at 100hz, mounted at a 0.25m sensor separation with bases carried 0.25m from the surface. The survey was conducted by walking parallel traverses in a zig-zag pattern, with traverses aligned northwest-southeast and positioned 1.25m 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 four features within Castle Greg fortlet: the rampart core, possible buildings, an area of burning, and an area of human activity.
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 which contain the survey metadata, along with point, line and 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
