tAlcheer coal field. 65 



If, instead of descending the Tengria Nullah from Gopalprasad, we 

 ascend it, we find, resting on the carbonaceous shales, beds of a different 

 series, which, though resembling some of those associated ■with the 

 shales, yet diiFer from them in being much coarser, more conglomeritic, 

 and more generally ferruginous ; in the absence of ironstone, and more 

 especially in the want of any blue and lUac shales and of all organic 

 remains (except possibly some very indistinct vegetable markings at 

 the base of the series.) 



These are the lower portion of the grits of the upper group of the 

 _ „ , 7 , , , field. They are evidently of much later date than 



Of much later date •' •' 



thanthe lower beds. any of those hitherto described, as all the lower 



beds had been enormously denuded previously to their deposition, 

 and very unequally denuded. Thus, in the Tengria Nullah, just men- 

 tioned, there is observed, towards the West, a total absence of the great 

 thickness of shales and sandstones, . which only 4 miles further to the 

 East rest on the carbonaceous shales. Still fiurther West, near Kunkerai, 



„ ^ , , ,. , greater denudation apparently existed, for near 

 Great cTenudation of ° i. s. j 



lower beds. ^l^jg village these upper grits appear entirely to 



overlap the carbonaceous shales and rest on the underlying beds. 



The sections hence to Patrapara are seldom good, and are valueless 

 for the establishment of any point, as the great similarity between these 

 beds, and those \mderlying them, renders it impossible to distinguish 

 the two in the absence of clear and well-marked sections. 



. At Patrapara, however, the unconformability of these rocks with 

 those underlying them is particularly weU seen. One side of a nuUah 

 exhibits the carbonaceous shales, with some 10 to 20 feet of clays resting 

 conformably on them ; while on the other side are seen the upper grits 

 resting upon their denuded surface. 



A clearer evidence could scarcely be desired of the great and very 

 irregular denudation, which the beds of the lower and middle groups 

 must have undergone previously to the deposition of the grits ; the 



K 



