The deposits of the useful minerals & rocks; their origin, form, and content . ferruginous cementing material in the black and red beds difiers ; that of theformer is rich in ferrous oxide, that of the latter in ferric oxide. Theblack seam contains on an average 35 per cent of iron \^dth 0-55 per cent ofphosphorus ; the red seam 18-22 per cent of iron. The operations formerly 1022 OEE-DEPOSITS carried on by the State, were abandoned in the year 1881. The presentyearly production is probably some 1000 tons. On the south slope of the Griinten a large number of oolitic iron bedsup t
The deposits of the useful minerals & rocks; their origin, form, and content . ferruginous cementing material in the black and red beds difiers ; that of theformer is rich in ferrous oxide, that of the latter in ferric oxide. Theblack seam contains on an average 35 per cent of iron \^dth 0-55 per cent ofphosphorus ; the red seam 18-22 per cent of iron. The operations formerly 1022 OEE-DEPOSITS carried on by the State, were abandoned in the year 1881. The presentyearly production is probably some 1000 tons. On the south slope of the Griinten a large number of oolitic iron bedsup to 1 m. thick were formerly opened up. It is probable that inreality the number of independent beds is small, but that these by faultsand overthrusts have become duphcated, giving the present appearanceof a large number. The iron content of the ore is low. England : Cleveland, and Northajvipton LITERATURE W. Fairley. .Toiirn. Iron and Steel Inst., 1871, p. 154.—G. Barrow. Proc. Cleve-land Inst. Eng., 1877 to 1880, p. 108.—H. Bauermann. Metallurgy of Iron, 1882, p. 89.—. Fig. 418.—Map of the Cleveland iron district. Scale 1 : 600,000. Sir LowTHiAN Bell. On the American Iron Trade, Journ. Iron and Steel Inst., 1890,p. 119.—A. L. Steavenson. The Last Twenty Years in the Cleveland Mining District,Journ. Iron and Steel Inst., 1893, XLIV.—.J. D. Kendall. The Iron Ores of Great Britain,1893.—Phillips and Loxns. A Treatise on Ore Deposits. London, 1896.—H. Louis. The THE OOLITIC IRON BEDS 1023 Iron Ore Resources of the United Kingdom of Great Britain and Ireland, in the Iron OreResources of the Workl, Stockhohn, 1910, Vol. II. p. 630.—H. B. Woodward. Lias ofEngland and Wales, Mem. Geol. Survey, 1893. Cleveland This important iron deposit, delineated in Fig. 418, occurs in theCleveland Hills in north-east Yorkshire, and is at present the most pro-ductive in Great Britain. It belongs to the Middle Lias, and generallyconsists of several beds separated by barren layers of
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