CHAPTER XVI. 
Miocene alluviums — Auvergne — Mont Perrier — Extinct quadrupeds — Velay— 
Orleanais — Alluviums contemporaneous with Faluns of Touraine — Miocene 
fresh-water formations — Upper Val d'Arno — Extinct mammalia — Coal of Cadi- 
hona — Miocene volcanic rocks — Hungary — Transylvania — Styria — Auvergne 
— Velay. 
In the present chapter we shall offer some observations on the 
alluviums and fresh-water formations of the Miocene era, and 
shall afterwards point out the countries in Europe where the 
volcanic rocks of the same period may be studied. 
MIOCENE ALLUVIUMS. 
Auvergne. — The annexed drawing will explain to the reader 
the position of two ancient beds of alluvium, c and e, in Au- 
No. 54. 
Position of the Miocene alluviums of Mont Perrier (or Boulade). 
a, Newer alluvium. e, First Miocene alluvium with bones. 
b, Second trachytic breccia. j c \ Compact basalt. 
c, Second Miocene alluvium with bones, g, Eocene lacustrine strata. 
d, First trachytic breccia. 
vergne, in which the remains of several quadrupeds character- 
istic of the Miocene period have been obtained. In order to 
account for the situation of these beds of rounded pebbles and 
sand, we must suppose that after the tertiary strata g, covered 
by the basaltic lava f, had been disturbed and exposed to 
aqueous denudation, a valley was excavated, wherein the allu- 
vium e accumulated, and in which the remains of quadrupeds 
