. Report of a geological survey of Wisconsin, Iowa, and Minnesota : and incidentally of a portion of Nebraska Territory : made under instructions from the United States Treasury Department . eculiar odour, and gives out but little flame. Its specific gravity is volatile matter, there is 54-5, chiefly light carburetted hydrogen; of carbon orcoke, 37-0; of coke itself, 45*5; of light green ashes, 85. A hundred grammes ofnitre required 278 for deflagration; which, if 12 be taken as the amount necessaryto deflagrate the same nitre, would give about 43 per cent, of carbon in both cokeand vol
. Report of a geological survey of Wisconsin, Iowa, and Minnesota : and incidentally of a portion of Nebraska Territory : made under instructions from the United States Treasury Department . eculiar odour, and gives out but little flame. Its specific gravity is volatile matter, there is 54-5, chiefly light carburetted hydrogen; of carbon orcoke, 37-0; of coke itself, 45*5; of light green ashes, 85. A hundred grammes ofnitre required 278 for deflagration; which, if 12 be taken as the amount necessaryto deflagrate the same nitre, would give about 43 per cent, of carbon in both cokeand volatile matter, and about 6 per cent, of carbon in the volatile matter alone. This coal does not present the appearance either of true lignite, or of brown has more the aspect of ordinary bituminous coal; especially of the poorer varietiesof splint or cannel coal. It is unlike them, however, in its elementary constituents;for, when exposed to heat, little or no coal-gas is given out, but only a little car-bonic acid and light carburetted hydrogen. It smoulders away, more like anthra-cite ; which, however, it does not resemble either in structure, lustre, or proportionof MAUVAISES TERR E S, NEBRASKA. After leaving the locality on Sage Creek, affording the above-mentioned fossils,crossing that stream, and proceeding in the direction of White River, about twelveor fifteen miles, the formation of the Mauvaises Terres proper bursts into view, dis-closing, as here depicted, one of the most extraordinary and picturesque sights thatcan be found in the whole Missouri country. From the high prairies, that rise in the background, by a series of terraces or MAUVAISES TERRES. 197 benches, towards the spurs of the Rocky Mountains, the traveller looks down intoan extensive valley, that may be said to constitute a world of its own, and whichappears to have been formed, partly by an extensive vertical fault, partly by the• long-continued influence of the scooping action of denu
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