St. Earth is situated on felspar and hornblende rocks belonging to the
porphyritic series. In many parts these rocks are so silicious as to
give rise to very unproductive soils; but in other places, where the
felspar predominates, the land is very fertile. These rocks are
traversed by metalliferous veins, which are richer in copper than in
tin ores.
EGLES-HALE, or EGLES-HAYLE.