Structure of the Eastern Alps. 339 



8. Light green and red, thinly foliated marls ; they are vertical, and parallel to the nummulite- 

 grits just described. 



We may here observe, that all these vertical strata are capped by a vast thickness of horizontal 

 coarse conglomerate, made up chiefly of the detritus of Alpine limestone. In its ran^e from the 

 flanks of the chain towards the plains, it passes in succession over the edges of all the vertical or 

 highly inclined deposits we are describing. 



9. Greenish grey, fine-laminated marls, passing in the ascending order into sandy, calcareous 

 grit. 



10. Light grey, calcareous grit, with many green grains, and with some minute pebbles of 

 white quartz. 



11. Thick beds of coarse, granular limestone, containing many broken stems of corals. 



12. Coarse, calcareous grit of a brownish grey colour. 



13. Greenish marls, passing into a cream-coloured marlstone, with a conchoidal fracture; 

 very like some varieties of chalk-marl. 



14. Thick beds of coarse granular, coral limestone, with precisely the same characters as 

 No. 11. The arrangement of the corals and comminuted shells in these beds nearly resembles 

 that of the coarse, coralline beds which immediately surmount the chalk at Maestricht. 



15. Light grey, calcareous and porous grit : the cavities occupied by many crystals of carbo. 

 nate of lime. This rock is quarried as a building stone. 



16. Cream-coloured marl, with a conchoidal fracture. 



17. Incoherent green-sand, charged with myriads of Nummulites of an undescribed species, 

 having a central depression in the disk. 



18. Fine-grained, grey, calcareous grit, with numerous minute, green grains. It is extremely 

 difficult of fracture, and rather thick-bedded : its strike is due E. and W., and therefore parallel 

 to that of the preceding groups. Its vertical edges are well exposed on both banks of the stream, 

 where it is surmounted by thick masses of the horizontal conglomerate. 



From the preceding group to the village of Siegsdorf, our section is inter- 

 rupted by a longitudinal valley of denudation about a mile in breadth, within 

 which the beds are all buried under alluvial accumulations. By a spectator 

 looking up this valley to the east (or in the exact strike of the vertical groups 

 above described), a succession of undulating hills would be seen in the distance, 

 ranging directly through the Kressenberg : and as the strike of the beds in all 

 this region is remarkably constant, it is obvious, independently of other geolo- 

 gical evidence, that we must seek among these hills for a series of strata to in- 

 terpolate between the group last enumerated (No. 18), and the deposits north 

 of Siegsdorf*. On examination, the ferriferous beds of the Kressenberg are 

 found exactly to satisfy these conditions ; inasmuch as they possess an inter- 

 mediate character, between the nummulite-grits last described, and the newer 

 deposits north of Siegsdorf. We postpone, however, the description of these 



* The accompanying section (PI. XXXVI. fig. 6.) has by mistake become reversed in engra- 

 ving. The Loheini ridge ought to have been on the right hand ; and in that case, the low ridges 

 seen up the valley south of Siegsdorf would represent the place of the Kressenberg series. 



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