214 Records of the Geological Survey of India. [vor,. x. 
rock is here a dense slaty rock almost as black as coal. The section above described strongly 
suggests the idea of a fault. 
This leads to the important question, are the Shali rocks Infra-Blaini or Krol P It 
might seem at first sight to follow from many of the facts I have recorded that these rocks 
are Infra-Blaini. If the Shall were Infra-Blaini then our sections would run thus— 
rProBpectHill 
1 
■ Krol. 
| Boileaugunj ... ..., 
Simla . 
. < 
1 Jako 
1 
Infra-Krol. 
1 
t.North Jako Road 
Blaini. 
Mahasu ... 
Simla slates. 
Fagu to Thiog 
Shali beds. 
’Simla slates. 
Thiog to Mattiana ..• 
Blaini series. 
Infra-Krol. 
.Krol. 
In such a section the anticlinal would be required in the Shali beds and would be 
drawn from Shali to a point between Fagu and Thiog. There are serious objections, 
however, to the adoption of this interpretation which I am not able to get over. In the 
first place, the axis of the anticlinal must be drawn, if drawn at all, from the Simla 
end of the Mahasu ridge to the top of the Shali: 2ndly, whilst we have a great thickness 
of Simla slates at the Simla end of the section, there does not appear to he a corres¬ 
ponding thickness at the other or Mattiana end: and Srdly, we should after all have to 
summon a fault to our aid to get rid of the damaging fact of the presence of the Blaini 
rocks at Sanj and to the north-west of Thiog. 
The alternative interpretation—the adoption of the Shali rocks as Krol— necessitates, 
however, the belief in the existence of a fault between the Shali and Mattiana (somewhere near 
Kuui); in another between Naldera (the ridge above Basantpur) and Simla; and in a series 
of faults, or a sort of circular fault, in continuation of the Naldera fault, running round to 
Arid, and probably on to Kakkukatti! It is rather appalling to have to adopt such a theory, 
hut I do not see my way out of it. 
IV.— Nakkanda—Kotgarh:—Rampur. 
In my last we travelled as far as Mattiana and for a few miles beyond. From the point 
we then reached to Narkanda and on to Kotgarh, the schists, micaceous and silicious, are 
somewhat undeterminate in character, hut looked to me more like the younger series than 
the old. A few hundred feet—500 or 600 it may be—below Kotgarh, there is a thin band 
of blue limestone which extends for some distance. Under it and down to the stream that 
divides Kotgarh from Kumhat'sen, the rocks appeared to be the carbonaceous, micaceous 
schists of the Infra-Krol series. The dip at Kotgarh is low and northerly, but wavers 
about from north-north-east to north-west and even more westerly. On the road down to 
Kapu (Kepu) (on the Satlej, due north of Kotgarh), some of the cultivated fields near 
Shawat have that peculiar black soil so often seen in the Simla section in the neighbour¬ 
hood of the black “crush rock.” I observed this feature in other places in this direction. 
As the Satlej is neared we come first on mica schists and then on the “ central gneiss.” 
At Kapu (elevation 3,125 feet), the dip of the gneiss is 40°-north-H°-west. 
Following the other road from Kotgarh to the Satlej, viz., that to Nirth, we have first 
slates ; then carbonaceous slates ; then the gneiss alternating with slates. From Nirth to 
the Nogli, which flows into the Satlej a few miles south of Rampur, we have slates alternat¬ 
ing with the gneiss; sometimes one showing, sometimes the other. Regarding the slates 
