***“The radiocarbon dates confirm activity in the period from 1472 to 1645. **
Ending in the Plague years.
Good idea, and that might account for all memory of the town having been lost.
‘In 1350, there was a great pestilence and mortality of men in the kingdom of Scotland, and this pestilence also raged for many years before and after in various parts of the world.’
Scotichronicon, John of Fordun
http://www.educationscotland.gov.uk/scotlandshistory/medievallife/blackdeath/index.asp