1869.] Geological JSTotes onHlie Khasi Sills. 27 



From the preceding notes and sections, it will be observed, that on 

 this longitude we have no infra-nummulitic coal as at Cherra, that the 

 seams here occur always below the last named formation, at a very 

 regular depth below it, and that unlike the coal of Cherra, it is very 

 persistent over a large area, and often to be found in a series of 

 deposits one above the other. It is to be traced along the high long 

 line of bluff that bounds the Tim Blay on the south, in its south-east 

 course to its debouchement near Puna Tith bazar. If this coal ever 

 be utilized, it must be somewhere in this neighbourhood, or between 

 longitude 91° 10' and 91° 20', and south of latitude 25° 26'. This 

 small area would well deserve a close inspection, and the results 

 would be extremely interesting, if continued to the east, the rocks be 

 followed out into the Cherra sections. Until this be done, it would 

 be premature to theorise, or draw comparisons, between different beds, 

 one of which, the limestone, is identical, while the beds both immediate- 

 ly below and above differ very much. I have already stated my 

 opinion that for a long distance, west of Chaudadinga, and the 

 Rongsiang rivers, but little coal can be expected to be found, from 

 the presence of tertiary sandstones on that side. 



This paper has now reached a size I little contemplated, yet with 

 its errors, with which no doubt it may abound, in bringing it to 

 a close, I trust it may prove useful to those, who may at some future 

 date visit, and plot out the same sections. 



Camp, Cherra Fooujee, October, 1867. 



