Dinas Dinllaen - Community Archaeology Project

  Geophysics

Introduction | The Promontory Fort | Geophysics | Community Engagement

Geophysical survey was undertaken to gain a better understanding of those areas not investigated by excavation. These included the interior of the fort and the third inner defensive bank. Two of the aims of the survey were to locate the entrance through the inner bank, and to look for structures within the interior of the fort. In all just over 2 hectares were surveyed using a fluxgate gradiometer which records magnetic levels in the ground. When the information collected is processed it can provide an image of what lies beneath the ground surface. The survey showed that the bedrock in the area gave very high readings, something which can be problematic as it can mask the weaker signals given by archaeology.

The survey was unable to identify the entrance through the inner bank, however, it was able to identify evidence for a palisade on this bank. This was because the local bedrock, which gave high readings, was used as packing stones for the posts, and this showed up clearly on the survey. The survey also revealed the presence of a possible ditch outside the bank, although this may be a feature associated with the later development of the golf course.

The interior of the fort was surveyed to try and find evidence of occupation. A local antiquarian, John Daniel, said that a number of hut circles were visible in the interior of the fort when he visited in 1892. It is possible that these were removed during landscaping of the golf course, which would explain why they are no longer visible. The survey did reveal a number of roughly circular features, which may be interpreted as round houses. However without excavation it is not possible to confirm this.

 

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