Records of the Geological Survey of India. 
[VOL. III. 
•36 
Clay beds .—At Dharoli, the beds resting upon the Par quartzite are white clays with 
bands of various colours. In this section not only are the blade shales overlapped, but some 
other shales above them: thus in the Sindh river at Bijura the following section is exposed, 
none of which is represented in the Dharoli section. 
Bijura .—The Par quartzite is not seen at base— 
30 feet 
2 » 
0 „ fi inches 
2 „ 0 „ 
1 „ (5 ,, 
1 „ 3 „ 
2 „ 0 „ 
i „ 0 „ 
black oarbouaceous, slisrlitly micaceous, finely laminated, shales. 
ditto ditto with gracious concretions, 
red and green shales, 
ferruginous shales with concretions, 
red and ^reen shales, 
shales with silicious concretions, 
red finely laminated ribboned shales, 
ditto with silicious concretions. 
Concretions .—The concretions occur as flatfish round balls of flinty chert, sometimes 
1A inches in the shorter, and "2i inches in the longer diameter; the longer diameter always 
being parallel to the bedding. 
In the Dharoli section the day beds pass upwards into an irregularly banded rock; the 
bauds of from one-eighth to one-bait' an inch in thickness and formed of alternate bands of horn- 
stone and silicious brown htematite, the bands of hornstone being most frequently the thicker 
of the two. The day beds appear to be very loeal in their occurrence ; for in many places, the 
hornstone beds form the bottom of this group. It seems possible that the day beds are the 
hornstone beds locally decomposed. The two are very similar in structure ; the hornstone is 
seen in all stages of decomposition, and the rocks somewhat higher in the section, and equally 
silicious with the hornstones have certainly decomposed into a similar day, as. for instance, 
at the iron mines near Mangor and Santow, &e., where the red and yellow clays can 
be traced along the strike into the undecomposed red and yellow jaspers. 
The thickness of the day and hornstone beds is about 50 feet. The section above them 
in ascending order is as follows:— 
Red ribboned jasper wilh ferruginous bands ... . .. 150 
Ribboned hornstone ... ... ... ... ... ... 50 
Red and yellowish, slightly ferruginous, finely laminated, banded shales ... 50 
Silicious ribboned shales ... ... ... ... ... ... 40 
Felsites and shales ... ... ... ... ... 20 
Contemporaneous trap (Oholira trap) ... ... ... ... 70 
Felsites and shales ... ... ... ... ... ... 40 
Limestone with bands of chert ... ... ... ... ... 50 
Felsites and shales ... ... ... ... ... ... 00 
Contemporaneous trap (Rein trap)... ... ... ... 50 
Silicious finely laminated ribboned shales, including bands of limestone ... 300 
Ribboned jasper and ferruginous shales ... ... ... ... 300 
Contemporaneous trap (M 0 r ar trap) ... ... ... ... 500 
Ribboned jasper and ferruginous shales ... ... ... ... 50 
Limestone with bauds of chert aud jasper ... ... ... ... 70 
Ribboned jasper, with ferrugiuous bands ... ... 50 
Semi-jaspideous ribboned shales ... ... ... ... . , iQO 
Concretions .—Concretionary structure is very common in the lower part of this section, 
particularly in the jasper-beds. Some of the concretions in these beds are four feet long and 
four inches thick, but the greater number are about six inches long and 11 inches thick; the 
longer axis always parallel to the bedding. The concretions are formed of thin laminae of red 
jasper and haematite, and arc mostly irregularly cracked in the interior and the cracks filled up 
with quartz crystals. In some of the concretions there are irregular cavities, sometimes 
4 inches long and inches high, lined with quartz crystals. The best sections of these beds 
can he seen in the gorges north of Si mi ria, where vertical cliffs of them more than 
100 feet high are exposed. The beds of this part of the section are locally worked for iron. 
A description of the mines will lie given presently. 
Felsites .—The felsites occur above and below the Clioura, Bela, and Puniar traps, as 
well as under the outlying hillock of trap near Fasoulee. They are mostly thin and 
regularly bedded, and in this respect resemble the silicious shales, with which they alternate. 
The most common variety of the felsites is a cream coloured felspathie matrix, in 
which are imbedded innumerable dark coloured crystals, probably of angite. Another variety 
consists of alternate irregular, thin light-cream, and dark-green, coloured layers, probably of 
felspar and hornblende. 
