532 
Mr. Buckland on the 
accumulation of post-diluvian gravel, partially filling up the diluvian 
gorge of the transverse valley, and protruding itself to a considerable 
distance into the main trunk of the longitudinal valley ; many 
striking examples of this latter kind may be seen in ascending the 
passage of Mont-Cenis on its western side from Aiguebelle upwards. 
Here, at the termination or mouth of the transverse vallies that fall 
into the main valley of the Arc, immense talusses of gravel of modern 
origin project into the latter valley, being often incumbent on, and 
easily distinguishable from, subjacent beds of diluvian gravel, and 
sometimes protruding across the great longitudinal valley, so as 
entirely to obstruct it, with the exception of a small passage which 
is kept open by the present river, in the lowest edge of the talus. 
I have seen also similar examples well displayed at the mouths of the 
transverse vallies that fall into the main valley of the Kiszucza River 
on the Hungarian side of the pass of Iablunka, at the west extremity 
of the Carpathians. Deposits of this kind go on accumulating daily 
under our observation, and may, by careful investigation, be always 
distinguished from that gravel which is strictly diluvian, as the Utter 
has also been shewn to be decidedly distinct from those more com- 
pletely rolled pebble beds of antidiluvian origin, that occur among 
the regular strata which compose the crust of our globe, and which 
must be referred to periods of still higher antiquity, and long distant 
from each other, as well as from that last universal deluge which 
has overwhelmed the earth. 
For the purpose of impressing more strongly this distinction 
which I have drawn between diluvian and post-diluvian gravel, it 
will be convenient if geologists will consent to restrict the term 
diluvium to the superficial gravel beds produced by the last universal 
deluge ; and designate by the term alluvium those local accumu- 
lations that have been formed since that period by torrents and rapid 
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