The extreme northern part of this parish, in an angular form, extends
upon the granite, surrounded on all sides by the granite of Lanlivery.
The remaining parts of the parish are composed of schistose rocks,
which next the granite are of the porphyritic series, but become of a
doubtful nature in the southern extremity; these latter belong perhaps
to the calcareous series, as do also some of the rocks in the
adjoining parish of Fowey. The felspathic rocks next the granite, like
those of St. Austell, are metalliferous, as is proved by the important
mines of Lanescot and Fowey Consols.
[14] A list of the Priors of Tywardreth, and extracts from a
Calendar of the Priory, now in the possession of Lord
Arundell, have been recently published in vol. III. of
“Collectanea Topographica et Genealogica,” 1835.