A lost Roman fortlet has been found near a primary school in Scotland. The site once stood next to the Antonine Wall but has been lost for centuries.
The discovery was made by Historic Environment Scotland (HES) experts who found the site in a field near Carleith Primary School in West Dunbartonshire. Previous attempts to find the fortlet have failed but the archaeologists were able to use a a new technique called gradiometry to look under the soil without excavation.
The surveying technique measures small changes in the earth's magnetic field to detect archaeological features that cannot be seen from the surface. It was able to find the stone base of the fortlet, which remains underground. The stone base would have been covered in turf which would have been used to build a rampart about two metres high.
