Megiliggar Rocks
The engine houses at Trewavas and Rinsey head are on a body of granite known as the Tregonning outcrop. This is thought to be an offshoot of a much larger body of granite which also surfaces at Carn Brea near Camborne. The Tregonning outcrop ends in the area around Megiliggar Rocks, and along the coast you can see the sills and dykes where the molten magma forced its way hundreds of metres into the existing slate rocks. The light-coloured stripes in the cliffs are some of the granite sills.
On walks
- Porthleven to Rinsey Head (6.8 mile walk)