This parish is composed of serpentine, and of a peculiar kind of
hornblende rock, already noticed under the head of Mullion. The cliffs
between Cadgwith and Poltesca afford many illustrations of the manner
in which these rocks are associated together.
* * * * *
A very excellent “Sketch of the Geology of the Lizard District,”
accompanied by a map, may be found in the first volume of the
Transactions of the Royal Geological Society of Cornwall, by Ashhurst
Majendie, esq. F.R.S. &c. now of Hedingham Castle in Essex.――Ed.