102 CRETACEOUS ROCKS OF S. INDIA. [PaRT II. § 1. 



or by horizontal deposition and subsequent disturbance, or by the succes- 

 sive operation of current action and tilting. This question is one which, 

 in most cases, it is sufficiently easy to solve. When extensive and clear 

 sections of a series of beds are exposed, it is generally an easy matter 

 upon mere inspection to detect false bedding, from the absence of paral- 

 lelism which is perceptible in the structure when a large surface is open 

 to view. In the present case, however, no such sections are obtainable, a 

 few square feet of rock exposed here and there, in nullah banks, being for 

 the most part the only sections available to the Geologist, and when, as in 

 the case of the nullah to the East of Odium, a tolerably continuous section 

 of the beds of from 6 to 20 feet in depth can be followed for any distance, 

 it is found that, with some slight exceptions, the lamination is on the whole 

 so regular that there is no good reason to infer that it is other than 

 that of regularly formed beds subsequently tilted up. The bottom 

 beds do indeed, as I have already observed, offer many evident and 

 undoubted cases of irregular deposition, as proved 



beds not due to subse- by their high and shifting dip, and by the absence 



quent disttirbauce, . ., /• t , i -.i • .-, 



01 any evidence ot disturbance either in the 



rocks themselves or at their boundary against the gneiss where such 

 could be easily detected. 



This absence of faulting, (with the single exception noted,) along 

 the entire boundary, is of itself sufficient argument against referring 

 sudden changes in the dip of the lower beds to violent local disturbance 

 at a period subsequent to their deposition, since, however the soft Cre- 

 taceous beds might yield to any great local strain, the rigid gneiss 

 immediately below would certainly show some signs of fracture, but 

 this consideration is by no means sufficient to prove that the general 

 dip of the bedding to the East or South-east has not been brought about 

 by an uniform elevatory movement to the West and North-west, and 

 unaccompanied by any violent local disturbance. If, however, this had been 

 the case, we should expect to find that the bedding, unless cut off locally 



