There is some underlying granite on Maria Island and a tiny fragment of the Mathinna beds. It could well explain the gold occurrence mentioned in the thumbs area. But without looking at magnetic's and gravity survey of it, i couldnt tell for sure if the granite pluton extended to the mainland of Tasmania.
- Tasmania_simple_geology_map.png (4.37 KiB) Viewed 993 times
Source: MRT geological report
Source: http://www.mrt.tas.gov.au/webdoc2/app/c ... STRIP=true
East coast undersea floor
http://www.marine.csiro.au/nationalfaci ... 0301s.html