giving an increase of 60 per cent. in 30 years.
GEOLOGY, BY DOCTOR BOASE.
This parish, like the last, rests only on granite; at low water, however, some felspathic rocks may be seen.
The granite exhibits the common varieties of this part of Cornwall, and is traversed by porphyritic beds; one of which at Mean is a compound of granular felspar and shorl in various proportions. This kind is of rare occurrence; it is traversed by veins of quartz, which are occasionally much intermixed with shorl; this mineral also abounds in the adjoining granite, but more particularly in the veins by which it is traversed.
Whitsand Bay is covered with a testaceous sand like that of St. Ives, of Padstow, and of other places on the north coast; a large tract of this sand is exposed at low water to the action of the wind, by which it has been drifted in considerable quantities inland so far as Sennen Green.
SHEVIOCK.
HALS.
Sheviock is situate in the hundred of East, and hath upon the north St. German’s Creek, east Anthony, west St. German’s, south the British channel.