St. Magnus Bay
This possible impact crater was identified purely on its circular shape. Bathymetry images do suggest there is a ridge on the far side of the bay, enclosing the area. However gravity and magnetic studies neither confirm nor deny the possibility of an impact. A. W. Sharp who proposed the idea did not believe glacial action could have caused the morphology present. He estimated the crator had an original diameter of 11km. J. Classen classified this locality as a C, where A is a definite impact crater and D is doubtful.
Image highlighting the shape of the bay.
Map obtained from Google Maps
Image showing contours of water depth around Shetland. Note the deep bay of St. Magnus with a shallower ridge further out.
Image obtained from Shetland Landscapes
References and Other Sources of Information
Sharp, A.W. (1970) St. Magnus Bay, Shetland: A Probable British Meteorite Crater of Large Size. The Moon 2, 144-156.
Classen, J. (1977) Catalogue of 230 Certain, Probable, Possible, and Doubtful Impact Structures. Meteoritics, Vol.12, No.1