GENERAL GEOLOGICAL NOTES. 15 



is known as the Patkai. Its extension, or representativCj further in the 

 same direction, north of Manipur and Caehar, is known as the Barail 

 ridge. Here it seems to be in very intimate relation on the south with 

 the almost abutting ridges of the Arracan system, the same formations 

 being seen to bend abruptly from the steady north-easterly strike of the 

 Patkai into the equally steady southerly trend of the contiguous ranges."^ 

 On its northern flank the Barail ridge passes close along the south-east 

 margin of the Shillong plateau — a name proposed by Mr. Medlicott for 

 the continuous, though deeply eroded, table-land commonly known as the 

 Jaintia, Khasi and Garo hills, separating Lower Assam from Eastern 

 Bengal.f 



* Journal, Asiatic Society, Bengal, Vol. XLIV, pt. 2, p. 210. 



t Vide Mr. Medlicott 's reports on tbe coal of Assam (Memoirs, Geological Survey 

 of India, Volume IV) and the Shillong plateau (Ibid, Volume VII). 



1853. Account of a visit to the Jaglu and Sisi rivers in Upper Assam, by Captain E, T. 

 Dalton, together with a note on the gold fields of that province, by Major Hannay. Ibid 

 Volume XXII, page 511. 



1856. Notes on the iron ore statistics and economic geology of Upper Assam, by 

 Lieutenant-Colonel S. F. Hannay, communicated by the Government of Bengal. Ibid, 

 Volume XXV, page 330. 



1859. Note on recent investigations regarding the extent and value of the auriferous 

 deposits of Assam, being abstracts of reports by Captain E. T. Dalton and Lieutenant-Colonel 

 S. F. Hannay, dated October 1855. Memoirs, Geological Survey of India, Volume I, 

 page 90. 



1865. The coal of Assam ; results of a brief visit to the coal-fields of that province in 

 1865; with geological notes on Assam and the hills to the south of it, by H. B. Medlicott, 

 A. B., p. G. s , Deputy Superintendent, Geological Survey of India. Ibid, Volume IV, 

 page 387. 



1874. Petroleum in Assam, by Theodore W. H. Hughes, a.e. 3. M., P. a. s.. Geological 

 Survey of India. Records, Geological Survey of India, Volume VII, page 55. 



1875. Proceedings of a Committee assembled by order of His Excellency the Governor 

 General in Council, under date the 28th January 1874, to consider and report on the best 

 means of improving the steam service on the Brahmaputra, and the water communication 

 with Upper Assam. Contains some remarks respecting the coal of Upper Assam, Assam 

 Gazette, 17th April 1875. 



1875. The evidence of past glacial action in the Naga Hills, Assam, by M:ijor H, H. 

 Godwin- Austen, P. E. G. S., F. z. s. Journal, Asiatic Society, Bengal, Volume XLIV, Part 2, 

 page 209. 



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