364 Professor Sedgwick and Mr. Murchison on the 



Teucher, one of the tributories of the Enns. A series of overlyin*^ grits and 

 shell-marls, nearly bounded to the east by a line drawn from Windischgarsten 

 to Spitlal-am-Prynn, are extended towards the west over a triangular area of 

 low undulating hills, and occupy a broad bay, which, though in the very 

 heart of the rugged calcareous chain, communicates through a long transverse 

 rent with the drainage of the Enns and the tertiary plains of the Danube. 

 As these shelly beds are much less inclined than the strata of the secondary 

 system surrounding them (some of which are almost vertical), they offer an 

 obvious and perfect analogy, both in their structure and relations, to overlying 

 groups of Gosau. 



In detached hills occupying a part of the valley north of Windischgarsten 

 is a coarse, granular, white limestone, in some places almost made up of small 

 Terebratulai of four or five distinct species, in other places nearly passing 

 into an irregularly oolitic structure. The relations of this rock are obscure ; 

 but it seems from its position to be a part of the green-sand series. The 

 sections on the north-eastern side of the town are, however, much more 

 instructive, and give the following successive groups in the ascending order. 



1. Younger Alpine limestone passing, at its superior limits, into hippurite-limestone, 



2. Calc-grit, fucoid shale, and sandstone. 



3. Overlying hills made up of grits, shell-marls, &c., containing many fossils of the shelly 

 series of Gosau, especially such as are found in the lower group. 



The facts of this section are so entirely in accordance with what has been 

 described above, as to rec^uire no further amplification or comment. 



4 Sections of the Overb/ing Deposits at Piesiing, Neue- Welt, Griinhach, ^c. 



Near the termination of the zone of Alpine limestone on the confines of 

 the basin of Vienna, deposits similar to those above described occupy several 

 inosculating valleys on the eastern side of Schneeberg and the Wand. Near 

 Piesting, for example, there is on the left bank of the stream a succession of 

 conglomerates, marlstones, and marls, containing Corals (Fungise), and various 

 Gosau shells, dipping to the east from the Alpine range, and passing beneath 

 the acknowledged tertiary formations of the basin of Vienna near Wollersdorf. 



A lofty mural ridge of Alpine limestone called the Wand, ranges from the 

 valley of Piesting to that of Grunbach, in a direction about north-east and 

 soutb-west, and forms the north-western boundary of a singular, longitudinal 

 valley of elevation called the Neue-Welt (New World), which, though very 

 near to the plain of Steinfeld and Neustadt in the basin of Vienna, is entirely 

 shut out from it by a second mural ridge of Alpine limestone parallel to the 

 Wand, but at a lower elevation. 



