Memoirs of the Geological Survey of India, Volume 2order of the Governor-General of India, 1860 - Geology |
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alluvium Bagra bands basalt Bijawur breccia calcareous carbonaceous Central India character clay coal conglomerate crystalline rocks Damuda and Talcheer Damuda beds Damuda rocks Deinwa denudation deposits described direction district disturbance east escarpment evidence examination exposed feet felspathic flags formation formed fossil fragments geological Ghât glen Glossopteris gorge granite green mud grey grits hill Hislop horizontal Hosungabad inches intertrappean Iron Johilla Jubbulpur junction Kymore Lameta laterite layers limestone lithological localities lower Damuda lower group Mahadeva boundary Mahadeva sandstone Mahanuddi marked mass massive Medlicott micaceous miles mineral Mopani Nerbudda valley observed occur oolitic out-crop parallel places plants portion present Puchmurri quartz quartzite Rajmahal range rectilinear remarkable rest Rewah ridge river schists seen Semri shales shells side similar species specimen surface Talcheer Tawa Tawa river thickness tion Tirhowan traced trap dykes unconformity upper Damuda vertical village Vindhyan دو وو
Popular passages
Page 62 - ... ore are common along the bottom of the boulder bed. The top three feet of the hard rock looks more like a reconstruction of materials than a rock in situ. It is an irregular streaked mass of clay, with occasional strings of broken grit bands; the crushing action which is so manifest in these upper layers extends itself to those below ; contortion and fracture on a small scale are evident throughout, &c.
Page 185 - This originates in a succession of beds of the softer amygdaloids, without any basaltic interstratification ; their superior angles disintegrate, and a slope results. But most usually three or four beds of amygdaloid are found between two strata of compact basalt; the former disintegrates, leaving a slope, which is not unfrequently covered with forest trees, forming a picturesque belt : the basaltic scarp remains entire, or it may be partially buried by the debris from the amygdaloids above ; but...
Page 268 - I do not think it improbable that a wide geological interval occurred between the consolidation of the fossiliferous beds which underlie the coal, and the deposition of the coal-measures themselves; that there is no real connexion between them, but that they belong to widely different geological systems, the former referable to the base of the carboniferous system, the latter to the oolitic, and neither showing the slightest tendency to a confusion of type.
Page 84 - ... and small lumps of green clay. " In the only hole I saw they were working the yellow clay from the crevices of this ; but the men told me that at a greater depth there are alternating layers of green mud, and of its mixture with calc spar in which diamonds are found.
Page 122 - Jabalpur on the south - west, a considerable extent of tolerably pure and beautifully saccharine white limestone is seen ; the river cuts a deep channel through the mass of this rock, exposing sheer vertical surfaces of the white limestones in places 220 feet high ; it JABU. is scarcely possible to exaggerate the picturesque effect of the varied outline and colour of the whole. The locality is well known as the Marble Rocks.
Page 105 - It is, however, incorrect to speak of this as a range of hills. Seen from the south it presents an almost uninterrupted series of headlands with projecting promontories and receding bays, like a weather-beaten coast line ; but these form the abrupt termination of a tableland, and are not an independent range of hills. It would be difficult to point out a finer example of cliffs, once formed by the denuding action of shore-waves, but now far inland, than is exhibited along this range. From the summit...
Page 68 - ... way into the pits. Here, the best material is a stiff unctuous clay with quartz gravel dispersed through it. There are other diamond workings in the gorge of the Boghin, which must be alluvial, as the entire excavation is to be attributed to the action of a river. The natives remove some twelve feet of dark brown clayey sand to get at the boulder bed, in the base of which diamonds are found ; but both here and below the narrow gorge the gravel at the surface of the river bed is much worked. Hereabouts,...
Page 68 - The principal diggings were at the lower end of the mine valley; they were removing some twelve feet of dark brown clayey sand to get at the boulder bed, in the base of which the diamonds are found, but both here and below the narrow gorge the gravel at the surface of the river bed is much worked. The natives spoke to me of a European who, some twenty years ago, had made an attempt at mining on a large scale. His diggings were on the flanks of the limestone hill, some fifty or one hundred feet over...
Page 62 - ... the base of the slope from the Kymore scarp ; there were five or six pits in progress. The section is— three feet of soil, on a smooth surface of boulder clay; this latter contains large and small rounded boulders of sandstone, possibly the remains of masses fallen from the retreating cliff...
Page 185 - Teekoneh (three-cornered) and Loghur. Escarpments. Stupendous escarpments are occasionally met with in the Ghats. In these instances the numerous strata, instead of being arranged in steps, form a continuous wall. At the Ahopeh pass, at the source of the Goreh river, the wall or scarp is fully 1500 feet high* ; indeed, on the north-west face of the hill fort of Hurreechundurghur, the escarpment can scarcely be less than double that height. On the other hand, the steps are sometimes effaced, and a...