346 Professor Sedgwick and Mr. Murchison on the 



6. Transverse Section from the Ridge of the Untersberg to the Vallei/ of 



the Saal. 



The accompanying figure* commences with the Alpine ridge of Hohe 

 Giill, and thence crossing the saliferous system of Berchtesgaden ranges 

 over the crest of the Untersberg ; the beds of which have a reguhir, northern 

 dip, and terminate in the ascending order witli a white^ close-grained^ sub- 

 crystalline limestone containing an extraordinary congeries of Hippurites. 

 M. Deshayes enumerates two species from this locality ; the most abundant 

 of which is found also in the Pyrenees, and has been figured by Picot de la 



Pey rouse t- 



The hippurite-rock is considered as the base of the following ascending 

 section ; the details of which are derived from three or four independent, 

 parallel traverses from the base of the Untersberg precipices to the banks of 

 the Saal ; the greatest number of beds are, however, laid bare in a ravine by 

 which a torrent descends past Schweiger Miihle into the plains. 



1. Fucoid grits and shales very ill developed, and only seen in one section near Kogel Miihle. 



2. A regularly bedded series of very great thickness, composed of stiff, unctuous marls with 

 bands of marlstonc, which partake both of the range and the high inclination of the Untersberg 

 strata. The lower portions of these marls are in some places of a purple colour, but their pre- 

 vailing colours are yellowish grey or greenish grey ; and the harder bands, when broken, often 

 exhibit dendritic impressions, and resemble the pldner-kalk of northern Germany. 



3. A group closely associated with the preceding. The marls are more laminated, of a green, 

 red, or variegated colour, and are traversed by indurated bands not to be distinguished by hand 

 specimens from the red chalk of Hunstanton Head and Speeton Cliff on the east coast of Eng- 

 land. Some of the hardest specimens resemble scaglia, and in some of the sections gypsum 

 occurs in this part of the series. 



From different localities in the two preceding groups we obtained the fol- 

 lowing fossils. 



Trochus linearis (a fossil of the upper green-sand, or chalk marl). Mantell, 

 Geol. of Sussex. Plate xviii. fig. 17. 



InoceramusCripsii {chalk marl). Mantell, Geol. of Sussex, Pl.xxvii. fig. H. 



Lucina. 



Belemnites and Baculites. 



Spatangi, resembling those of the upper green-sand or lower chalk. 



4. Marl beds not so unctuous as the preceding, but becoming sandy and micaceous, and 

 alternating with bands of coarse sandstone passing into conglomerate. These are overlaid by 

 blue, green, red, and variegated marls, some of which contain innumerable crystals of selenite, 

 and bands of gypsum rich enough to be worked for use. In the ravine descending to Schweiger 



* Plate XXXVI. fig. 9. t Descriftion de quclques Orthoceratites : 1781. 



