52 Geological Society. 



refer to the list of fossils derived by Count Munster from this locality, 

 and they entirely coincide with the opinions which he has published 

 respecting them. This tertiary system is almost entirely composed of 

 sand and sandstone which, here and there, contain many particles of 

 green earth, in some places resembling tert'ary molasse, and in 

 others not to be distinguished from secondary, green sand. Subordi- 

 nate to this system are eleven beds of granular hydrate of iron (vary- 

 ing from five to seven feet in thickness), which are extensively 

 worked. 



After the details of the preceding section, the great derangements 

 of the neighbouring Alpine chain are briefly noticed. It is shown that 

 there is a double axis of elevation, one of which passes through the 

 great calcareous zone ; and along the line of the Inn produces a 

 southern dip in the saliferous series, which seems to carry them under 

 the older rocks but which on the contrary form the true central axis. 



5. Tertiary deposits in the Valley of the Inn. — These were proba- 

 bly once of considerable extent, occupying a basin about twenty 

 miles in length, but not more than three or four miles in its greatest 

 breadth. Tlioy are now chiefly seen near Hiiring, where a bed of 

 coal thirty four feet in thickness is extensively worked by means of 

 long horizontal levels, which traverse a great succession of strata. 

 These beds are described in great detail, and are principally com- 

 posed of fetid marls in various states of induration. The coal and 

 overlying beds contain many land and fluviatile shells, and have at 

 first sight the appearance of a great lacustrine formation. Some of 

 the beds above the coal, contain innumerable impressions of well- 

 preserved dicotyledonous and other plants, many of which are in 

 the course of examination by M. Adolphe Brongniart. There are, 

 however, several marine shells in the strata, which show that the 

 sea ascended up this part of the valley of the Inn during the period 

 of the Haring deposit. From the general character of these marine 

 shells, some of which have been identified with those of the London 

 clay, the authors are disposed to refer the whole deposit to an early 

 part of the tertiary period. 



6, Sections of the tertiary formations of Bavaria. — The authors 

 first remark, that the line of demarcation between the secondary 

 and tertiary groups, is generally well defined ; but they also derive 

 from this region several proofs that the tertiary seas ascended up 

 the old valleys of the Alps a long way to the south of the average 

 direction of this line. In proof of this they refer to some deposits 

 in the valley of the Isar. They then describe in detail the sections 

 between Fiissen and Schongau, in which an enormous succession of 

 beds is laid bare on the banks of the Lech. 



They afterwards describe the section of Nesselwang, in which the 

 lowest strata of the tertiary series are of great thickness, and are 

 raised against the side of the Alps in a vertical position. They 

 remark that the tertiary system has here a coarser structure than in 

 most parts of the range ; that beds of conglomerate abound in the 

 lower part of it ; and that the beds of molasse and marl are en- 

 tirely subordinate to them. Lastly, the authors remark no less 



than 



