Previous studies have suggested the site was home to a ploughed over burial ground.
By driving over the field with the GPR, the researchers were able to reveal 32 oval ditches under the surface.
Dr Stamnes said: “I’ve asked a few of my colleagues, but so far haven’t found anything similar to this find in other excavations.
“So it’s difficult to conclude what it might be.”
However, the expert added, the ditches appear to be clearly orientated towards the sea and may have been a house foundation.