This parish is entirely situated on granite, which in many places
furnishes a good and fertile soil, as has been observed in the
adjoining parish of St. Burian. Its fine sea cliffs exhibit many
varieties of the granite, and distinctly show the manner of
arrangement in the more common and larger masses. To enter on the
details of this subject, would occupy too much space. The geologist
will find ample amusement along the whole line of these cliffs, which
are always viewed by the romantic tourist with great delight. Besides
the elevation and grand contour of the cliffs, here will be found the
celebrated Logan Rock at Trereen, and the Tunnel Rock at
Tol-Peder-Penwith.