The greater part of this parish is situated on granite, which presents
the varieties common to the Land’s End district. The northern part, in
the form of an irregular band, consists of schistose rocks, with the
exception of a small patch a little to the north of the church, and
another which extends from Polmear Cove to the western boundary of the
parish. These slates are for the most part felspathic, and, at their
points of junction with the granite, exhibit some beautiful
illustrations of granitic veins in the slate.
* * * * *
Note, that Penzance, by a mistake, is not numbered among the parishes
[nor is Tregoney]; so that the real number of them must be 204 [or
rather 205].