Chap. V.] trichinopoly district — ootatooh group. 61 



at other places, which I shall describe more at length in a subsequent 

 chapter, it is equally certain that the lower beds rest undisturbed on the 

 crystalline rocks ; so that this line of boundary is formed by a series of 

 small parallel faults between which the bottom beds of the Ootatoor 

 group are occasionally exposed, where not concealed by Trichinopoly 

 outliers. It seems highly probable that at Muddam this latter condi- 

 tion obtains, for although, as stated, the limestone itself protrudes from 

 a. little outlier of Trichinopoly beds, yet within a stone's throw to the 

 West of it gneiss is seen in place between two strips of Ootatoor beds, that 

 to txie North highly inclined and apparently faulted against it, that to 

 , the South nearly horizontal and undisturbed. Now if we suppose this 

 condition of things to be prolonged beneath the Trichinopoly outlier, 

 the relation of the limestone and the Ootatoor and Trichinopoly 

 beds respectively might be such as are shown in the accompanying 

 imaginary section ; so that in the absence of evidence to the contrary, 

 there is no reason to believe that the limestone in this case is 

 really of Trichinopoly age. I may mention that, although elsewhere the 



Fig. 4. Diagram shewing supposed iielations of the beds near Muddam. 



o. Ootatoor beds. t. Trichinopoly beds, g. Gneiss, &c. /. Coralline limestone. 

 Ootatoor and Trichinopoly beds are frequently undistinguishable in 

 mineral character, in this immediate neighbourhood there is no danger 

 of confounding them ; the one being fine gypseous shales, the other a 

 coarse gneissose conglomerate, frequently full of the debris of the 

 denuded lower beds. 



We now pass on to the hmestone at Cullygoody, which is in all respects 



the finest example met with of this peculiar rocli. 

 Cullygoody ridges. 



It forms a broken ridge or series of ridges about 



8i miles long, extending along: the edge of the Cretaceous rocks from 



