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 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 speakin
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 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 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. 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
