342 Professor Sedgwick and Mr. Murchison on the 



1. Light grey, calcareous marls, with indurated bands resembling jylaner-kalk. 



2. Bluish grey, micaceous marls, of considerable thickness, and with calcareous bands ; soaie 

 of which are composed of calc-grit, others of compact, argillaceous limestone resembling blue and 

 white lias. 



3. A great series of bluish grey flag-stones, alternating with marls, generally blue, but here 

 and there of a red or greenish red colour. 



It is unnecessary to enter on any further details respecting- the structure of 

 this ridge, as it obviously occupies the same part of the series as Loheim^ Alp- 

 Spitz, and other hills described in the previous sections. On its south side 

 some of the strata are contorted ; but on its northern escarpment they have a 

 constant dip to the south at an angle of about 40", and therefore seem to 

 plunge under the Alpine limestone. This collocation can only be accounted 

 for, on the supposition of one of those longitudinal faults, so common in the 

 Eastern Alps, ranging along the base of the precipices of the Rauschenberg. 



After descending down the northern side of the Kachelstein ridge, and 

 crossing a narrow ravine, we meet with a series of brown, ferruginous, num- 

 mulitic calc-grits, dipping south at an angle of 80°, and rising into a peak 

 called the Kleine Kachelstein, which is connected with, and forms a part of, 

 the Kressenberg system. The difference in the inclination of the strata of the 

 Kachelstein and Kressenberg ridges, their difference of mineralogical cha- 

 racter, and the appearance of the ravine between them, would have induced 

 us, independently of any other considerations, to suppose that a second great 

 fault ranged along this ravine at the northern base of the Kachelstein, in a 

 direction nearly parallel to the former; and when we compare the details of 

 this section with those derived from the neighbouring parts of the chain, we 

 find our supposition established beyond any doubt. To place the nummulitic 

 series of Kressenberg under the Kachelstein ridge, would be a direct in- 

 version of the sequence of deposits observed throughout the Eastern Alps. 



Ascending by the highly inclined nummuhte-beds above mentioned, we 

 pass over a number of sandy and nearly incoherent strata deeply tinged with 

 hydrate of iron, and here and there containing green grains. Several of the 

 groups could not be mineralogically distinguished from ferruginous varieties 

 of the English green-sand ; and in some places, especially where they contain 

 fossils, they pass into calc-grit. We found among them no traces of the blue 

 shale and compact limestone ; and indeed we may state generally, that there 

 is little resemblance between the structure of this and the Kachelstein rid":e. 

 Further to the north the section crosses a series of highly inclined and 

 ferruginous strata, occupying a surface about 800 feet wide, composed 

 of calc-grit, sand, and sandstone. In general they are deeply tinged with 

 hydrate of iron, and some of them contain green grains, and specks of brown 



