Se ee hey ie ce ete eer ee oe eee 
Geology. 123 
schistose diorites, eurites and leptynites. This protogine formation is 
intimately associated with the argillo-calcareous shales of the lower an- 
thracitic series, which are found interstratified with and even passing i 
gneiss and other feldspathic schists. Gras concludes that this somewhat 
irregular interpenetration of the two classes of rocks is due to an irregu- 
os 
arts of | 
the upper anthracitic series, and in both the upper and lower there are 
on; this view he declares is the only one which appears to agree with 
the observed facts, This protest against the theory of the igneous origin 
des Roches, pp. 300-301.) : 
Our author however supposes that all these altered strata are of car- 
boniferous age, and remarks that the fossils in the limestone of the lower 
lias show but slight marks of metamorphism, from whence he concludes 
that “in this region of the Alps there are no highly peeisenpiicee ju- 
‘ F : 
Cc ” and that the metamorphi on “which ce be- 
neath the sea before the elevation of these mounta ceas w- 
as of pas 
mene talcose schist. At the same, although the liassic and so-called 
assic 
4S More or less talcose and greasy to the touch, but the alterations of 
-argillaceous rocks our author regards “as rather mechanical than 
chemical.” (p, 76.) 
The question before us is then, whether in that series of rocks which 
embraces liassic and jurassic beds with gypsum, dolomite, anthracite, and 
4 carboniferous flora, and which geologists have generally referred to one 
Sreat system not older than the lias, we have really in these mountains, 
 - 
? 
