Les dépôts de minéraux utiles et les rochers ; leur origine, la forme et le contenu . le 1018 dépôts de minerai en phosphore, en raison de l'abondance de fossiles, phosphorique est élevée.Les minerais étaient autrefois soudés à l'Hedwig travaille à Helmstedt. Au sud-est de cette occurrence Lias de l'horizon du fer oolitesoccurs entre Helmstedt et Oschersleben, autour de Marienborn, Sommerschenburg,et Badeleben. Ce dépôt est généralement nommé afterSommerschenburg. Les lits appartiennent ici pour les ammonites Ammonites bisulcatus zones d'BucMmidiand le Lias ; ils sont doucement undulatingand, généralement speakin dip

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The deposits of the useful minerals & rocks; their origin, form, and content . the 1018 ORE-DEPOSITS phosphorus content, owing to the abundance of phosphoric fossils, is high.The ores were formerly smelted at the Hedwig works at Helmstedt. South-east of this Lias occurrence the horizon of the iron oolitesoccurs again between Helmstedt and Oschersleben, around Marienborn, Sommerschenburg, and Badeleben. This deposit is usually named afterSommerschenburg. The beds belong here to the Ammonites BucMmidiand Ammonites bisulcatus zones of the Lias ; they are gently undulatingand dip, generally speaking, 9°-10° west-south-west. The separationbetween the ore-bed and country-rock is not sharp. The ore in thefoot-wall and hanging-wall gradually merges into a sandy ferruginousmarl or into clayey-calcareous weathered material. The ore is calcareous, argillaceous, or arenaceous. Only the calcareous portions, which consistalmost entirely of coarse, lustrous, oolite grains with very httle cementingmaterial, are payable. These oolites are flat, lenticular, elliptical, or angular. Fig. 416.—Oolitic ironstone at Bislich on the Lower Rhine.Einecke and Kiihler. Scale 1 : 100, 000. in shape. The thickness in the neighbourhood of Sommerschenburg is2-6 m. and the length 10 km., the original length having been reduced tosome extent by erosion. The ore contains 30-32 per cent of iron, as wellas CaCOg and MgCOg, AlgOg, and SiOg. Its character on the whole isvery similar to that of the Harzburg occurrence. It was formerly smeltedat the Hed^^dg works at Helmstedt. In the year 1903 an oolitic ore-bed, 8-5 m. thick, was accidentallyfound at a depth of about 470 m. in deep bore-holes for coal on the lowerRhine west of Wesel, at Bislich. This occurrence is illustrated in Fig. 416.The discovery was all the more sensational since the ore in structure andcomposition was very similar to Lorraine minette. According to the latestate geologist Dr. Mliller, this ore also belongs to the Middle Lias. Furthe

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