254 M. BnoDi GJi I ART on the 



"When we have passed the first and largest collection of 

 fallen masses, which descended in 1751, we observe in the 

 first escarpment we pass : 



1st. A micaceous clay slate (No, 3), resembling that of 

 the hill du Mont ; it is blackish and solid. 



2dly. A greyish compact limestone (No. 4), which alter- 

 nates with the slate, forming more rounded and solid salient 

 portions. 



3dly. Towards the upper part, a grey and blackish com- 

 pact limestone (No. 5), full of numerous veins of spathose 

 limestone, and also alternating with the slate (No. 3). 



A second collection of fallen rocks is then traversed, and 

 we reach another escarpment, which is composed, 



4thly, Of a thick bed of argillaceous slate (No. 6), very 

 fissile and splintery, traversed throughout, and in every di- 

 rection, by nodular seams of white spathose limestone (No. 7) 

 and veins of quartz. 



5thly. Of a schistose sandstone of a very compact texture, 

 and yet of a very fissile structure (No. 8). 



A third collection of fallen rocks (C) then follows, in a 

 great measure composed of large parallelopipedal pieces, 

 which are very extensive and difficult to traverse. It leads 

 to a third escarpment, presenting nearly vertical walls of 

 great elevation, the strata of which are cut into very large 

 parallelepipeds, by fissures perpendicular to each other, and 

 lined with calcareous spar. It exposes at its base, 



6thly. A very compact greyish limestone (No. 9), tra- 

 versed by steatitic and chloritic veins, disposed in the form 

 of net-work, and in some strata constituting an amygdalo'i- 

 dal steaschist (steaschiste amygdalin), the almond shaped 

 portions being very large. This calcareous mass is lined 

 ■with calcareous spar of the variety with the short dodecahe- 

 dral prism. 



7thly. Above, and in thick beds that are apparently solid, 

 but which are however very splintery, is a micaceous and 

 quartzose sandstone, alternating without order with the mi- 

 caceous argillaceous slate and with the blackish schistose 



