The filter has emphasised the man made ditches running parallel to the fort on the right hand side, indicating that they also run around the southern end towards the inlet, viewed on the left hand side. The Roman track is still visible across the top right and the building in the centre of the fort is very evident and clearly not a geological feature, which the high pass filter would remove. Due to it’s central position in the middle of the Norman fort it is impossible not to reach the conclusion that this may be the first Norman keep. Having studied documents that suggest that Norman architecture prior to 1094/5 was wooden in construction this “building”, as it appears to be raises more questions about the site than it answers at this stage.
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