TI.— Geneeal Geological Notes.* 



Crystalline Mocks. 



Little is known of the mountain-mass at the head of the Assam 

 valley, to the north-east, whence flows the sacred 



Patkai range. 



branch of the Brahmaputra. The range that 



trends thence to the south-east, between Upper Burmah and Assam, 



* The chief object of our expedition being a purely economic one, little time was avail- 

 able for geological observation foreign to the main question. The Naga Hills are covered 

 by the densest jungle and unsafe to enter without the necessary encumbrance of a guard; 

 no food can be obtained, and one is continually hampered by the difficulty of carrying supplies 

 for a large camp ; geological work is thus carried on under many disadvantages at any time. 

 For more than half the time we were in the field, however, we were practically without map 

 of any kind, Thornton's, published in 1849, being, as far as the Naga Hills are concerned, 

 absolutely useless. During the remainder, the new Topographical Survey Maps were avail- 

 able. 



and limestone near the Jamuna falls, and the limestone and salt springs in the Nambar river. 

 Journal, Asiatic Society, Bengal, Vol. XIII, p. 771. 



1844. The Naga tribes in communication with Assam, by John Owen, Calcutta, 1844. 

 Includes notices, derived from previously published papers, respecting the mineral products 

 of the Naga Hills. 



1845. Analysis of lignite from Assam by H, Piddington, Esq., Journal, Asiatic Society, 

 Bengal, Volume XIV, page Ixxxv. 



1845. Report of a Committee for the investigation of the coal and mineral, resources of 

 India, for May 1845. Calcutta, 1846. This was the Committee's final report. 



1845. On the Assam petroleum beds, by Captain S. Hannay. Journal, Asiatic Society, 

 Bengal, Volume XIV, page 817. 



1848. Extract from a memoir of some of the natural productions of the Angdmi Naga 

 Hills, and other parts of Upper Assam, by J. W. Masters, Esq. (communicated by J. W. 

 Bushby, Esq., Secretary to the Government of India). Journal, Asiatic Society, Bengal, 

 Volume XVII, Part 1, page 57. 



1848. Extracts from letters from Major Hannay respecting the Jaipur coal. — Ibid, 

 Part 1, page 167. 



1848. Correspondence regarding the coal beds in the Namsang Naga Hills, communi- 

 cated by Captain T. E. Rogers, Superintendent of Marine. Ibid, Part 1, page 489. 



1851. Analysis of coal and of galena from Assam, by H. Piddington, Esq., Journal, 

 Asiatic Society, Bengal, Volume XX, page 366. 

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