Egles-Kerry is almost entirely situated on that extensive chain of
downs, which runs across the country from Launceston to the Bristol
Channel; composed of rocks which are very quartzose, but in many parts
appear to be almost entirely felspar, commonly, however, united with
some colouring material which stains them to a dark blue. This is
particularly the case near the church, where the rocks very strongly
resemble those at Rosecradock, and in other parts of St. Cleer.
Northward, these rocks appear to pass into the Dunstone; but it must
be confessed that their geological position is not yet elucidated;
for, like the compact rocks of King Arthur’s Castle in Tintagel, of
St. Stephen’s, and Pentire Points, on each side of Padstow Harbour,
and elsewhere, they yet require to be carefully and patiently
investigated.