ESCHER VORARLBERG. 1! 



{Upper freshwater. 

 Marine. 

 Lower freshwater. 



Eocene / 2. Hysch. 



^^^^^^ -1 3. Nummulitic beds. 



4. Limestone of Sewen. 



5. Gault. 

 Urgonian. 



feocomian. 

 J . J ^* Upper ? Jurassic. 



"•"^^^^^^ ^ 9. Middle Jurassic. 



Cretaceous 



•1 6. Ui 



L 7. Nt 



Lias 



10. Fucoidal schists. 



11. Marly limestone with Ammonites Amaltheus, &c. 



12. Red limestone with hornstone. 



13. Limestone with Megalodon scutatus. 



14. S. Cassian beds. 



15. Dolomite (fossils at Esino, Lake Corao). 

 Trias ■{ 16. Schists with //a/oim. 



17. Letten-kohle. 



18. Muschelkalk (Lombard Alps). 



19. Bunter-Sandstone (Regoledo). 



20. Verrucano. 



In reviewing this series of strata, the author commences with those 

 which are sufficiently characterized to serve as a geological horizon. 

 These are the two members of the Lias, Nos. 11 and 12. This 

 group is well developed in the Vorarlberg and the Tyrol, and parti- 

 cularly in the Spullers Alps, to the north of Klosterle on the Arlberg 

 road, and at Elbigenalp in the valley of the Lech. 



The stratum No. 1 1 is that which M. Schafhautl has termed the 

 Fleckenm.ergeln. It contains some Fucoids and coaly matter, and 

 attains a thickness of 400 feet. It has yielded the following fossils : — 



Ammonites radians, Schl. Ammonites torulosus .', Schubl. 



A. falcifer ?, Sovj. A. Desplacei ?, If Orb. 



A. annulatus, Schl. A. heterophyllus, Sow. 



These are referable, according to M. D'Orbigny, to the Etage Toarcien. 



Ammonites planicosta, Sow. Ammonites Regnardi, jyOrh. 



A. margaritatus, Montf. A. Henleyi, Sow. 



A. Valdani, D'Orb. A. firabriatus, Sow. 

 These characterize the Etage Liasien. 



Orthoceras (Melia, D^Orb.). Inoceramus Falgeri. 



It appears that there is a melange of fossils in this bed. 



The red limestone with hornstone, No. 12, consists of red marly 

 concretionary limestone, with red and green nodules of hornstone, 

 and varies in thickness from 20 to 100 feet. The silex sometimes 

 forms layers which, in the lower part, alternate with limestone a 

 great number of times. These beds, which appear to be the equiva- 

 lent of the Lias of A.dneth( Salzburg), contain fossils referable to the 

 Etage Sinemurien, viz. — 



Ammonites Bucklandi, Sow. Nautilus aratus, Schl. 



A. Conybeari, Sow. Belemnites brevis, Bl. 



A. Turneri .-', Soiv. 



Consequently, although as yet neither Plagiostoma giganteum nor 

 Gryphcea arcuata have been found in them, these beds without doubt 

 belong to the Liassic epoch. 



