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PART 2.] 
Ball: Bisrumpur Coal-field, 
41 
of tlie latter at tlie period of the deposition of the Talolnrs is well shown by the broken 
character of the boundaries. In the Gehur and Mahan sections 
iron pyrites. many of the slates abound in iron pyrites, which is generally 
decomposed near the surface and covers the rocks with a copious efflorescence of sulphur. 
I saw no traces of copper, hut from the similarity of the rocks to the copper-bearing beds of 
Singhbhum, it is by no means improbable that it may exist. 
The Gagar river south of Karnji traverses a deep gorge, and gives an admirable section 
of the nearly vertical rocks through which it passes. They consist of slates, indurated 
shales, quartzites and hornblendics, the last mentioned sometimes exhibiting a cannon 
hall structure. 
One slightly calcareous slate contained a few striated moulds, or impressions of apparently 
organic objects, but what they could have been has not been 
Organic impressions ? •, . . , 
determined. 
A steady strike to nearly west-north-west east-south-east prevails in these rocks. Where 
not vertical, the dip is to south-south-west at a high angle. 
Near the village of Kuthwan, interbedded with quartzites, &c., there is a conglomerate 
formed of rounded fragments of quartzite, jasper, &c., hound to¬ 
gether by a very hard quartzose paste. 
Conglomerate. 
A spur of quartzites, &c., penetrates for six miles west of the main boundary at Chanchi 
into the basin. It is not now covered by the sedimentary rocks; indeed south of Daria 
it forms some small hills which rise above the general level. 
In the stream south of Daria, V. S., the conglomerate just mentioned is again seen; 
it is on exactly the same strike as the portion of it which is near Kuthwan, or nine 
miles off. 
At Ara, as already mentioned, the granites come in, cutting off the slates. On or 
I 'mestone about the line of junction, there is a run of limestone, which 
contains crystals of tremolite. 
West of the Pilka hill there are quartzites, which must, I think, he referred to this 
group; and the hills south of Paharbulla consist of rocks of the same character. 
One notable difference I observe between the rocks of this group as seen in Miin- 
blium and Singhbhum and in Sirguja, and that is, that the 
schist™ 00 ° f maenesian varieties of magnesian schist which are common in the former 
and furnish a considerable proportion of the total thickness, are 
nearly altogether absent in the latter. 
