What is relative dating in archaeology
Investigations of this concretion using handheld metal detectors and a magnetometer indicated it also contained significant quantities of metal throughout its mass.
Further excavation was halted at this point in order to photograph the concretion for the production of a spatially correct photomosaic of its upper surface. hammers, chisels and pneumatic chipping hammers ultimately yielded the bulk of the ordnance and munitions recovered from the entire wreck site.
However, a large concretion, measuring approximately 6m x 5m, located at the eastern end of gully ‘W’ required significantly more effort to break up and excavate.
The site contained many rocks of boulder size between 25 kg and 1500 kg in weight.
These were known as a serpentine and one surviving example was found on the site.