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Pariou, like those of M ount Somma, which
are turned towards Mount Vesuvius. The
Puy de Pariou was, in all probability, a volcanic
cone formed within the larger crater
by its last eruption of scoriæ. The formation
o f one volcanic cone within another
is one of the most common phenomena in
recent volcanoes, and many of the volcanic
mountains in Auvergne appear to have
been formed within larger craters, as will
be noticed at the Puy de Chopine.
The annexed cut represents the external
shape of the Puy de Pariou, and the dotted
lines show the form and depth of the crater,
the bottom of which « a is about three hundred
and twenty feet below the highest part
of the rim c. The current of lava b b
seems to have issued from an opening on
the north-east side of the present mountain.
The dome-shaped mountain on the left is,
I believe, called Sarcoui, but Sarcoui and
Cliersou so nearly resemble each other,
th a t it is difficult to distinguish them, and I
omitted noting down the name on the spot.
The external shape of Pariou approaches
to quadrilateral, or is that of a cone compressed
on each side, and somewhat elongated
from north to south. The crater,
x 4