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the river j and form a mural precipice on the S.W. side of the city of 

 Salzburg - . They are described in detail, and are shown to have ori- 

 ginated in the mechanical degradation of the neighbouring chain ; and 

 having a high inclination which carries them under the micaceous 

 sandstones of the northern plains, are, on that account, referred to 

 the lower part of the tertiary system. 



3. Section from Untersberg to the plains N.E. of Rekhenhall. — The 

 authors here give a short account of the great secondary system of 

 Alpine limestone ; and the Untersberg beds, which contain innumer- 

 able Hippurites, are shown to belong to the highest part of that series. 

 Over the Untersberg beds, the section exhibits the following suc- 

 cession. 



a. A great deposit of marl and marlstone, generally of a gray, but 

 in some places of a red colour ; containing a few fossils resembling 

 those of the chalk formation. 



b. Sandy, micaceous marls alternating with conglomerates and mi- 

 caceous, calc-grit, with Nummulites. Subordinate to this system are 

 red and variegated marls, with gypsum. 



c. A system of beds composed of blue, micaceous slate-clay and 

 greenish, micaceous sandstone. 



d. A great succession of alternating masses of blueish, micaceous 

 marl, slate-clay, sandstone, and conglomerate. Some of these upper 

 marls contain beds of gypsum and fossils, resembling the suite of 

 Gosau. The whole of the preceding series is succeeded towards the 

 north by the tertiary, slaty, green sandstone of the plains. 



As all the deposits above described are conformable to each other, 

 there is a difficulty in drawing the precise line of demarcation be- 

 tween the secondary and tertiary formations : the authors (though 

 not without some hesitation) place the nummulite-rock, which is 

 associated with the lower gypseous marls, at the base of the tertiary 

 group. 



4. Section from the Stauffenberg, through the. Kachelstein and the 

 Kressenberg, towards the plains of Bavaria. — In this section the Stauf- 

 fenberg and the Kachelstein belong to the outer zone of secondary 

 Alpine limestone, which in this region is enormously dislocated, so 

 that the subordinate beds are not only contorted and pitched up at 

 high angles, but generally plunge in towards the axis of the chain. The 

 Kressenberg rises to the height of 500 or 600 feet on the north side of 

 the Kachelstein, and forms a gradual slope towards the northern 

 plains. Its subordinate beds dip at high angles of elevation towards 

 the south, those which are nearest the secondary ridges being inclined 

 at 80°. This position gives the system of the Kressenberg the ap- 

 pearance of dipping under the secondary rocks, an appearance which 

 the authors consider entirely deceptive, and for which they account by 

 the intervention of a great fault. They consider the beds of the Kres- 

 senberg hills as tertiary ; because, though inch'ned in the same general 

 direction with the secondary mountains, they are not conformable to 

 them 5 because they contain no Ammonites, Belemnites, or other se- 

 condary fossils ; and, lastly, because they contain very many organic 

 remains which characterise tertiary formations. The authors here 



