With the exception of a small patch on its eastern extremity, this
parish is situated entirely on granite, affording varieties similar to
those of Gwennap, Redruth, Camborne, and Crowan, all of which are
intersected by beds of porphyry, called by the miners elvan courses.
The slate which occurs on the eastern side of this parish is
felspathic, resembling that of the adjoining parish of Gwennap.
[1] There is no such name in Domesday Books; Mr. Hals must
have misread Stratone or some similar name.