This parish extends from near Wendron Church almost to the Loo Bar, in
the form of a long stripe running a little west of south; rather more
than a quarter part of this stripe, at its northern extremity, rests
on granite; all the remainder belongs to rocks of the porphyritic
series. The extensive workings of Whele Vor mine are partly situated
in this parish, which is intersected by numerous veins and courses of
porphyry.