Geology Fieldwork – Cligga Head
The small mass of granite known as Cligga Head, forming a bold promontory between St. Agnes and Perranporth on the northern coast of Western Cornwall, has long been known, not only to the geologists of that county, but also to others from farther afield.
At Cligga Head, near Perranporth, greisens are only a few centimetres thick, bordering narrow cassiterite veins. The greisen minerals are associated with chlorite and tourmaline.
It’s an ideal site to study greisened (late stage alteration) granite; tourmaline dyke; contact metamorphism.
Cligga Head is a 25 minute drive from St Ives by coach.