Structure of the Eastern Alps. 347 



Miihle there is no red chalk in this part of the series, but it is traversed by bands of coarse sand, 

 stone, and of calcareous grit full of Nummulites, some of which are found ranging through the 

 gypsum quarries. 



5. A system of great thickness, but much concealed by horizontal, overlying masses of gravel. 

 It is composed chiefly of brown and bluish green, micaceous sandstone, alternating with blue, 

 micaceous, laminated marl and shale, and is supposed to terminate a little below Schweiger Miihle. 



6. Alternating beds of pebbly sandstone, gritstone, and blue marl, of great thickness and much 

 concealed like the preceding, but laid bare by some of the torrents descending to the Saal. The 

 upper portion of this group is chiefly composed of micaceous, blue marls, with subordinate bands 

 of calcareous grit, containing many fossils. Though the inclination of the successive beds 

 gradually diminishes as we advance to the north, the dip is considerable even to the extreme 

 limits of the section, where all the strata disappear under the alluvion of the Saal. 



Different parts of the group (No. 5.) overlying- the variegated, gypseous 

 marls contain, in addition to the Nummulites, several species of fossils. From 

 our collection Mr. J. Sowerby has made out the following list. 



Pectunculus. 



Pecten. 



Natica canrena (green-sand), Parkinson, vol. 3. Plate vi. fig. 2. 



Vermetus. 



Nummulites, two species. 



Operculiiia (D'Orbigny). 



Dentalium. 



Serpula, &c. — To which we may add stems of obscure organic bodies, 

 which seen on the fractured surfaces of the calcareous grit might be mistaken 

 for Belemnites. 



The blue marls forming the upper portion of the highest group (No. 6.) 

 have a much better preserved suite of fossils. Out of our small collection 

 Mr. Sowerby has selected the following, some of which are identical witii 

 shells found in the overlying deposits of Gosau. 



Pectunculus calvus. Sowerby, Plate xxxviii. fig. 2. 



Cardium productum. xxxix. fig. 15. 



Rostellaria granulata. xxxviii. fig. 2.3. 



Pleurotoma, very neur P . prisca of the London clay. Min. Con. Tab. 386. 



Dentalium grande. Calcaire grossier. Deshayes, Mem. de la Soc. d'Hist. 

 Nat. tome 2. Plate xvii. fig. 1, 2, 3. 



Ampullaria, or Natica, of the same species as one in the highest blue marls 

 of Traunstein*. 



Auricula simulata. London clay. Min. Con. Tab. 1G3, fig. 5 — 8. 



Volvaria. Corals, &c. &c. 



* Plato XXXVI. fig. «. 

 2y2 



