Geology of the Nicobars. 213 



Specimens received from Br. Rink, with the above interesting letter. 

 Conglomerate covering the Plutonic rocks at Nangkoory. 

 Claystone, with some of the sandstone alternating with it, at Kamorta. 

 Claystone very common on the Island of Kamorta, with some sulphate 



of magnesia. 

 Conglomerate sandstone of Kamorta. 

 Sulphate of magnesia found in the claystone of Kamorta. 

 Plutonic rocks near the village Unjadug, Nangkoory. 

 Claystone from the flagstaff hill at the Nangkoory harbour. 

 Sandstone alternating with the claystone at Kamorta. 

 Plutonic rock near the village of Alhacoong, Nangkoory. 

 Claystone very common on the Island of Kamorta, taken from the flagstaff 



hill at the Nangkoory harbour. 

 Conglomerate sandstone, Kamorta. 

 Claystone near the village of Unjadug, Nangkoory. 

 Small Dyke in the Plutonic rocks at Nangkoory. 

 Sulphate of lime found in the claystone at Kamorta. 

 Conglomerate alternating with the claystone at Kamorta. 



Correspondence with Major Jenkins, on the discovery of Coal of a 



very superior description, in a new situation in Tipper Assam. By 



Lieut. Dalton, (Plate V.) 



[Private Letter from Major Jenkins to Dr. McClelland.] 



I have great pleasure in sending you herewith a few specimens 

 of coal which have just been sent me by Lieut. Dalton. They are 

 from an entirely new locality under the Abor hills, a little above 

 Dibrooghur, or about the point where the hills approach nearest to 

 the river : the exact spot is unknown to me. The veins were found 

 in a small Nullah called the Durjmoo, just a little within the gorge 

 of the hills. 



We are indebted for this discovery to Lieut. Dalton and Captain 

 Reid, who have been lately making a small excursion up the Durj- 

 moo, the first ever made by an European. 



The only point of geology that Dalton notices as connected with 

 this coal, is the following : — 



" We entered the gorge of the hills through which the river 

 (Durjmoo) emerges to the plains, and found ourselves, by a sudden 

 transition in a very deep ravine, locked in by most precipitous hills 



