Dr Daubeny on the, Volcanoes (^Auvergne. 9T 
That the Puy Crenelle is volcanic, can hardly be doubted, 
when we consider the identity of its character with that of the 
Puy de la Peye contiguous, which, as we said, contains frag- 
ments of scoria imbedded. A more difficult point to decide is, 
whether this and the adjacent rock are relics of a stratum, the 
remaining portions of which are removed, or whether they have 
been raised by sonie force from beneath, through the limestone 
beds on which they seem to repose. 
The latter opinion appears to be most probable, since we can 
hardly suppose so complete a destruction of a whole stratum, 
as is implied by the former hypothesis ; but it must be confes- 
sed, that we have scarcely data to decide whether the produc- 
tion of these rocks is to be referred to an era subsequent to the 
Mosaic Deluge, or was anterior to that event. 
In bestowHg on the trap-rocks near Clermont that existed 
prior to the excavation of our present valleys, the general appel- 
lation of Volcanic^ I own that I have been guided by analogy 
rather than by actual appearances ; there is nothing at least in 
the external characters of the basalt of Montaudaux or Gergo- 
via which stamps it as the result of the agency of heat, more 
than that of Arthur’s Seat or the Giant’s Causeway ; yet, if it 
should afterwards appear that the basalts of Mont D’Or have 
clearly resulted from fire, I do not know how we can refuse our 
assent to the probable inference, that those near Clermont have 
a similar origin, as they seem almost continuous with the for- 
mer. The reader will therefore be pleased to suspend his judg- 
ment on this point, until he shall have perused that part of the 
paper which relates to the rocks in Mount D’Or and' Cantal. 
Magdalen College, Oxfokd, 
July 30. 1820. 
VOL. IV. no. 7. JANUARY 1821. 
G 
