PART 1.] 21c2Iahon: Notes of a tonr Ikroujk llangrang and Spill. 5i) 
Judging from tlie talus, I am under the impression that tlie rocks on the 
south-east side of the pass, namely, in the direction of the Thagiriga trigonomet¬ 
rical station, consist of slates faulted against the limestones ; but I had no time 
to scale these cliffs to examine them. On the north-west side of the pass, and 
down to Hango (elexation 11,500 feet), the lime.stones continue; the north-easterly 
dip cliange.s near the summit of the pass to a low west-north-west dij), pi'oduciiig, 
when the beds are viewed from below, an a23peai"Ance of unconformity. 
On the descent, at an elevation of 13,400 feet, clay slates ro-appear, dipping 
.south-west. From this point, owing to gi’eat contortion, the lime.stones and slates 
alternate several times, being sometimes jjeipeudicular, at others dijjj'ing south- 
south-west. Near the bottom of the descent, a compact quartzite becomes 
prominent, sometimes jDei’pendicular, sometimes dipping south-west-by-south. 
In color it varies from a bluish to a pinkish-white. Close to Hango, as another 
result of contortion, the thin-bedded limestones and slates re-appear, having an 
extremely high (nearly perpendicular) north-east dip. 
The quartzites above described and the thin-bedded limestones at the top of 
the pass belong, I apprehend, to the Krol formation. I doubt if hand specimens 
could be distinguished from those taken from the Krol mountain itself. Most of 
the beds weather a dark blue, but some brown. The rock abounds in white 
calcite markings, similar to those so common in typical Krol I’ocks. The purple 
calcareous clays 1 have described as occurring on the south side of the jiass 
reminded me of the jmrplish-red, sometimes calcareous clays of the Krol and Boj. 
Proceeding onwards towards Leo on the Spiti river, the first rock seen on 
leaving Hango, and which dips north-east, is a highly silicious white limestone 
(weathering white) with a faint shade of green in it, due a^qiaivmtly to the 
presence of a little chlorite. On the weathered surface I saw what looked like a 
cast of Nautilus spitimisis, only about half the size of that ligured in Plate IV, 
Memoirs vol. Y, as one of the Lilang fossils. It seemed to vanish into nothing 
when examined with the aid of a lens, and broke into 2 )ieces on the first ajjjdi- 
cation of the hammer, leaving me in a 2 )ainful state of doubt whether I had seen 
a real fossil or not. 
The limestone just described is overlaid by a hard silicious dull jnnki.sh- 
white limestone that weathers a dull red-brown. It miglit easily be taken for a 
quartzite, but it effervesces slightly with acid (strongly when jiowdercd), and a 
qualitative analysis of it shows that it contains a good deal of lime and some 
magnesia. A thin slate is intercalated with these limestones. There are some 
hundreds of feet of these rocks, but I cannot say exactly liow thick they m-e, as 
the hill side i.s obscured by talus for some miles. The reddish-weathering lime¬ 
stone appeared, from blocks that had fallen down, to be overlaid by a bluish- 
white quartzite. 
As I journeyed onwards the north-east dip appeared to flatten and then to 
change temporarily to east-south-east, the change of dip bringing dow'n to the 
road dark-blue limestones resembling those at the to]i of the Ilangrang pa.ss. 
