The deposits of the useful minerals & rocks; their origin, form, and content . hrough the surface Diluvium, the further extension of these depositswill have to be determined by boring. At the Kahlberg east of Kreiensen and in the neighbourhood of Kahle-feld, Echte, Oldershausen, and Wiershausen, the Jurassic, as illustrated inFig. 413, occurs completely developed. The middle division comes tosurface in the south-east, the beds dipping as much as 30°, but as a rulemuch flatter, into the hill. The mining area covers several square kilo-metres. According to Schloenbach, the dark, red-brown, and v
The deposits of the useful minerals & rocks; their origin, form, and content . hrough the surface Diluvium, the further extension of these depositswill have to be determined by boring. At the Kahlberg east of Kreiensen and in the neighbourhood of Kahle-feld, Echte, Oldershausen, and Wiershausen, the Jurassic, as illustrated inFig. 413, occurs completely developed. The middle division comes tosurface in the south-east, the beds dipping as much as 30°, but as a rulemuch flatter, into the hill. The mining area covers several square kilo-metres. According to Schloenbach, the dark, red-brown, and very fine-grained ironstone is oolitic, contains many fossils, and reaches a thickness THE OOLITIC lEON BEDS 1015 of 1-5 to 2 metres. It belongs to the horizon of Ammonites old mines at Oldershauseu likewise worked an ironstone bed, 1-5-2 thickness, the ore from which was smelted at Karlshiitte near early figures of the iron content of the ore, 34-38 per cent, are probablyunreliable ; it is more likely that the composition was similar to that of. Wiershausen Bc?5Sl mm Heuper LowLias V////A E;;;^;^ Hersum bed andCoral Dolomite Lou/. & Up Lias ?ith Ooliticlronsfone Broun Jura Diluvium Lias to Broun Jura Fig. 413.—Oolitic ironstone in the Kahlefeld-Echte Lias syncline. Scale 1 : 50, and Kuhler. the foregoing associated deposits. In any case the bedding conditionsappear favourable for exploitation. The ironstone bed on the Heinberg near Salzgitter likewise belongs tothe Middle Lias. It comes to surface and dips at a low angle to the bedding conditions are regular for some 5 kilometres. The thicknessof this oolitic ironstone, which has a calcareous matrix and belongs to theMargaritatus beds, is 1-2 metres. The iron content is very low. 1016 ORE-DEPOSITS The most important of these Middle German occurrences are thoseat Harzburg on the north border of the Harz, iUiistrated in Fig. 414. Theseconsis
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
