Chap. IX.] faults. 151 



places over 20 miles of country, is, in portions of the field, perfectly- 

 uninterrupted. The thickness of the various formations, excluding the 

 Upper Panchet and Talchir rocks, has been shown to be about 10,000., 

 and as there is no amount of unconformity between any series above 

 the Talchir, which can possibly account for an absence of more than 

 1,000 feet of rocks altogether, and as all the beds are cut off by the 

 South fault, all the higher ones abutting against it, it is only reasonable 

 to conclude that the throw of the South fault cannot be less than 9,000 

 feet, or nearly 1 mile and three-quarters. How much more it may be it 

 is impossible to say. It is probably more than 12,000, for the above are 

 minimum measurements, and the throw is only known to exceed them. 

 The great fault which bounds the North of the Talchir field is 

 Comparison with Tal- parallel to that on the South of the Eaniganj 

 field, and, although at a distance of 250 miles, may 

 very possibly be due to the same disturbing forces. Its throw, however, 

 is reversed. Indeed, the two fields of the Damtida and Brahmani 

 Rivers have some singular points of resemblance, both being brought in 

 by parallel faults, which cut off the whole of the rocks comprised in 

 them. This, indeed, appears to be the prevailing character of the small 

 areas of Damtida, Talchir, and other sedimentary rocks dispersed over 

 Bengal and Orissa, and the districts lying immediately West of them. 



Another parallel fault, of great size, exists in the gneiss of Kundit 

 Kuraya. It is marked by scattered rises, composed of the breccia, 

 which, in the metamorphic rocks, and occasionally, in the Talchir, but 

 never, so far as is known in Bengal, in the Damtida rocks,* accompanies 

 most faults of any size. The great faults of Central India appear to 

 follow a different direction from those in Bengal, but, in the latter 

 province, it is probable that nearly all the largest faults have an Easterly 

 and Westerly direction. f 



* It occurs, however, between Damudas and Metamorphic rocks, and contains fragments of both, 

 ■j- Or more correctly East by South to West by North. 



