T. S. Hunt on Alpine Geology. 7 
stones, conglomerates and argillites, occasionally with anthracite. 
The serpentines and euphotides which appear among the crys- 
talline schists at Bramant, near the line of the tunnel, were not 
met with, nor was the underlying gneiss encountered. 
work terminated at Bardonecchia among the crystalline lime- 
stones. 
According to Sismonda and Elie de Beaumont, there is 
throughout this entire section no evidence of inversion, disloca- 
tion or repetition in the series of 7000 meters of strata, a conclu- 
sion which they support by very cogent arguments. Lory, on 
the contrary, while he agrees with the observers just mentioned 
geological age of these crystalline schists and limestones, appear 
o us untenable in the light of Sismonda’s investigations. If 
we admit with the latter that the whole section of the tunnel 
represents an uninverted series, and with Favre that its upper- 
most and uncrystalline portion at Modane is truly of carbonif- 
erous age, it is clear that the great mass of crystalline schists 
which anderlie the latter should correspond more or less com- 
pletely to the pre-carboniferous crystalline strata to the north- 
west of Mont Blanc. Among these latter, in fact, as observed, 
by Favre, there occur at Col Joli and Taninge crystalline lime- 
stones and talcose schists like those of Maurienne. Accord- 
ing to this view, which harmonizes the conflicting opinions, and 
makes the crystalline schists and limestones of the southeast 
