Chumbi •>' Chumba-Peak 
16 
Records of the Geological Survey of India. 
f 
\ 
[ VOL. V. 
become predominant, and show, 
about 100 feet below the shales, 
some very fossiliferons bands. It 
is, however, impossible to obtain 
anything determinable out of the 
rock, but on the weather-worn 
surfaces, I observed numerous 
specimens of an Oyster, which I 
consider to be Gstrea Haidingeri, 
as well as several other things as 
yet undeterminable. I have little 
doubt that these limestones are 
Triassic, although the palaeon¬ 
tological evidence is still very 
small. But the general aspect of 
the whole group is so entirely 
like some portions of the Upper 
Trias in the Alps, and further, as 
there are Triassic beds of the 
Alpine type, well known in the 
Spiti districts of the Himalaya, 
I do not hesitate to place these 
limestones in the Triassic forma¬ 
tion. I have seen no sections in 
this neighbourhood which go 
deeper than the Trias. 
To give a single and easily 
accessible section bearing out the 
statements just made, I will de¬ 
scribe a line, of which a very 
rough sketch is given in the 
accompanying figure. The first 
glance will show what enormous 
contortions and faultings the 
rocks in this district of the 
Himalaya have undergone, and 
how difficult it must be to trace 
the succession of the layers, when 
they are cut through by faults 
at nearly every 100 paces, and 
when these faults are not visible 
at the surface. The scale to 
which the section is drawn does 
not allow of all the contortions 
which exist in reality being 
shown. I was compelled to limit 
myself to the principal ones, 
which determine the succession 
of the layers. 
