AURUNGA FIELD : BARAK AR GROUP. 71 



(11). Same as 8 10 (/' 



(12). Eed (liver-coloured) and greenish shales, 100' at 25° . 88' 7" 

 Gneiss . • 



300' 6" 



If 50 feet are added to the above, the total, 350 feet, will give as near 

 as possible the maximum thickness of Barakars cut off north of the fault. 

 The minimum thickness probably does not exceed 20 feet. 



It may be that these liver-coloured clays, No. 13 of section, represent 

 Talchirs. Though occurring at most of the natural junctions, they are 

 nowhere so well developed as in this section. In some cases they 

 occur not actually as bottom beds, but are underlaid by sandstones or 

 grits, which seem properly referable to Barakars. Though it is true 

 they are somewhat an unusual form of rock to meet with in Barakars, 

 they differ from Talchirs both in texture and mode of fracture. 



The last section of these rocks which is seen in the Sukri, though 

 short, is a very interesting one, as it affords 

 of faS?^* '''*'''''*''''' evidence of the intersection of the two faults at 

 the precise spot where from their directions further 

 east it was concluded that they would meet. In the angle included 

 between them, tlie Raniganjes are let down in a V-shaped trough, a seam 

 of carbonaceous shale, which is clearly seen on the south side of the V, is 

 cut out by the east to west fault on the north, and the edges of the 

 beds brought into contact with those of the cut-ofB Barakars. 



The next areas of Barakars to be described are those which occur 

 to the south-east of Pochra, and are included in 

 Pochra. " ^ ^^ angle formed between the northern of the pair 



of Latiahar east- west faults, and the great north- 

 west south-east fault. The rocks mainly consist of coarse grits with a 

 large amount of concretionary ironstones. In the raviney ground south 

 of Subano, the streams shew indications of the existence of a patch of 

 Raniganjes cut off by the fault. As near as possible the limits of this 

 patch are given on the map, but the relations are not very clear. The 



( 71 ) 



