428 Notices of Memoirs — Indian Geological Survey. 



other, the former having been imnaensely denuded before the depo- 

 sition of the latter. 



The Gwalior Series is composed of quartzite, sandstone, limestone, 

 jasper, and contemporaneous trap. It is divided into two groups — 

 the Par, and above it the Morar Group. Diorite is the form of trap 

 which occurs in these beds, a variety in which the separate crystals 

 of hornblende and felspar are visible to the naked eye. Magnetic 

 iron is found in it. 



The Vindhyan rocks occurring in the area were described by Mr. 

 Mallet (see Geological Magazine, April, 1870, p. 171). Their age 

 was pointed out as very uncertain, possibly Devonian. No con- 

 clusion can be drawn as to the exact place of the Gwalior Series in 

 the Indian scale. 



2. Note on the Slates at Chiteli, Kumaon. By Theodore W. H. 

 Hughes, F.G.S. — The author having been requested to report on the 

 suitability of the slates for roofing purposes, accordingly visited the 

 locality, where an experimental quarry had been opened. The 

 slates dip at high angles, but they are not cleaved in a definite 

 manner. Their general quality bears favourable comparison with 

 other Indian specimens; but it is below the standard of typical 

 Welsh slate. It differs from the latter in splitting along the planes 

 of lamination, instead of the planes of cleavage. It is coarser in 

 texture, and more siliceous. The slate is good enough for roofing 

 purposes, it well withstands the action of the weather, and slabs less 

 than a quarter of an inch in thickness, and much more than a square 

 foot, superficial measurement, may be easily obtained. 



3. Note on the Lead Vein near Chicoli, Raipur District. By W. T. 

 Blaneobd, F.G.S. — The ore (galena) occurs in a well-marked vein, 

 chiefly composed of quartz, which traverses the metamorphic rocks. 

 The vein also contains pink felspar, green and purple fluorspar. 

 Slight but unmistakeable indications of the presence of copper were 

 found. The width of the vein varies greatly ; sometimes it is six 

 feet, at others, nearly 30 feet. Altogether, Mr. Blanford thinks 

 there is nothing in the appearances presented by the Chicoli Lode, 

 inconsistent with the occurrence of a good vein of lead and copper 

 ore below the surface. He adds, that it is the first instance of a 

 distinct metallic Lode he has seen in India. 



4. The Wardha River Coal-fields, Berar and Central Provinces. By 

 Dr. Oldham, F.E.S., etc. — These coal-fields have been previously 

 noticed in the " Records," Vol. ii.. Part 4, p. 94, but since that time 

 great progress has been made in the detailed exploration of the field. 



Thick beds of coal had been observed in the banks of the river 

 Wardha, but their continuance inland could not be traced, owing 

 mainly to thick coverings of clays. It was found necessary to make 

 borings, the results of a few were given in the previous report ; 

 records of the other borings, and the general results are now given. 

 The inland extension of the coal-beds has been proved in many 

 places, and their great and sudden variation in character is markedly 

 indicated. In Wun district, to the West of Wardha, there is esti- 

 mated to be about 70 square miles of country under which the thick 



