Optically stimulated luminescence dating
Such stories may have their origins in folk memories of submergences that occurred during the prehistoric period.Sea-level Rise Since the Last Glacial Maximum (circa 20,000 BP) rising sea-level has served to isolate the Isles of Scilly from the Cornish mainland and transform them into their present form.The Lyonesse project aims to build on previous work, resolve the question of sea level rise in Scilly and provide data to inform climate change studies.Geophysical Survey - Sidescan sonar Sidescan sonar will be used to locate and map areas of exposed peat on the seabed.Results from the initial sampling will feed back into the second year of fieldwork, informing on further sample locations and sampling methods.The second year of fieldwork will complete survey of the inter-tidal peats and check to see if any additional areas have been exposed.
For offshore sampling, we anticipate using diver and diver-assisted sampling.
Peat is a poor sonar reflector while sand, the predominant material on the seabed in St Mary’s Sound, is a very good sonar reflector.
The outcrops of peat on the seabed should therefore be easy to locate using sidescan sonar.
This project is co-ordinated by Historic Environment Projects, Cornwall Council.
It will include the participation of experts from Cardiff, Aberystwyth, Exter and Plymouth Universities as well as the Cornwall and Isles of Scilly Maritime Archaeological Society (CISMAS).