The Lizard Peninsula
The Lizard complex is Britain's most complete example of an ophiolite. Much of the peninsula consists of the dark green and red rock, serpentinite, which forms cliffs as at Kynance Cove, and can be carved and polished to create ornaments. This ultramafic rock forms a very infertile soil which covers the flat and marshy heaths of the Goonhilly Downs.
Read more about this topic: Geology Of Cornwall