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In conclusion, a few remarks may be made with regard to the connection between the district just described and other parts of Garhwal and Kumaun visited by me in the course of last season.
From the point where the east and west Nyar rivers meet, I went north-east up to the head of the east Nyar, finding nothing but the schistose series the whole way until Kainur was reached. There, the presence of more decided schists, and garnetiferous schists, heralded the incoming of more of the gneissose granite. Dudatoli, the culminating peak of the neighbourhood, like Kalogarhi in the district just described, is composed of that rock; and from it in a westerly direction extend bedded bands, strongly developed at first, but dying out gradually. All details are out of place here, as the work is still only half mapped; but I would wish to point out the exact correspondence between the gneissose granite, both in composition and in habit, here and at Kalogarhi. The only difference is, that it comes on more strongly, but at the same time more gradually: some of the first bed-like intrusions alternating with schists, as though the result of direct metamorphism. By tracing the beds laterally, however, it is seen that they die out away from the central mass of Dudatoli, and close in towards it; so that they are in reality but elongated "fingers" protruding from the Dudatoli massif.
Further north, beyond the head of the west Nyar river, we have a faulted junction, bringing in purple slates and the massive limestone along the Dobri-Danpur ridge; beyond which a thick set of diorites and quartzites make a first appearance. From here in a south-east direction towards Naini Tal we cross a similar set of formations.
One may then say (roughly generalizing) that the schistose series and gneissose granite about Ranikhet and Dwárahath are most probably representatives of like beds described in the foregoing paper; whilst the slates and massive limestone displayed about Naini Tal are, with equal probability, representatives of the purple slates and limestone also there described. It is to be noted, however, that the Tal beds, or at least the fossiliferous portion of them, are not seen near Naini Tal, and the nummulitics, though said to have been found by Messrs. Schlagintweit are almost certainly absent also.
Notes on the Geology of the Garo Hills, by T. D. LATOUCHE, B.A., Geological Survey of India.
The main features of the geology of the Garo Hills have been known for several years and described in the Records and Memoirs of the Geological Survey, but the valley of the Sumesary, where considerable fields of coal exist, is the only portion of the hills that has hitherto been examined in detail. During the past
'See Manual of Geology of India, p. 609; also Journal, Asiatic Society of Bengal, Vol. XXV, p. 118.
2 Records, Vol. I, Pt. 1, p. 11. Vol. VII, Pt. 2, p. 58. Mem. G. S. I., Vol. VII, p. 151. Records, Vol. XV, Pt. 3.
d. Tal: Mesozoic.
b. Purple slates &c.
Ganges a. Schistese Series. Inner Formation.
Section along BB.
PART OF BRITISH GARHWAL SECTIONS. See the 1-inch Map
Sub-Himalayan (U. Tertiary).
Purple slates, &c.
Schistose series Garnitiferous.