and the Deposit in which it was imbedded. 279 



visited (Eningen, of which he has given a section and description*,, and in 

 which differing- from Karg, who had not only asserted that the deposit was 

 superposed to all other formations of the neighbourhood^ but had even been 

 accumulated within the historic period, he endeavours to prove that it is 

 subordinate to the adjoining molasse, and of about the same geological age 

 as the Paleeotherian strata of the Paris basin. My observations, however, 

 whether derived from actual sections, or from a consideration of the orsranic 

 contents of the quarries, have induced me to come to diff"erent conclusions 

 from both these authors, and to think that the (Eningen formation is ex- 

 clusively of ancient, lacustrine origin, yet entirely posterior to the molasse 

 of Switzerlandf. To prove this position 1 shall offer, 



1st, A description of the deposit and its relations to the surrounding 

 country, with actual sections of the quarries. 



2ndly, A sketch of their contents, including a special account of the car- 

 nivorous quadruped by Mr. Mantell, and a synopsis of other organic remains 

 formerly and recently discovered. .. ; 



3rdly, Conclusions drawn from the previous details. 



The Rhine, in its course from Constance to Schaff'hausen, flows for many 

 miles in a depression of the tertiary marine formation known by the name 

 of Molasse, which being cut through transversely, is exposed in hills on both 

 banks, at heights varying from seven to nine hundred feet. These hills, 

 consisting of micaceous sandstone and conglomerate, form the western pro- 

 longation of that great range of tertiary deposits which extends along the 

 flanks of the Austrian and Bavarian Alps, and has been described by Pro- 

 fessor Sedgwick and myself. The marls and limestone of ffiningen are 

 recumbent on this molasse, and are seen in various patches on the sides of the 

 hills, and are worked in two quarries at diff'erent elevations overlooking the 

 Rhine. 



Section across the Valley of the Rhine, shozving the Relations of the Lacustrine Format ivii 

 of (Eningen to the Inferior Marine Molasse. 



N. 

 Schienen gebirge. 



<£ 



^^;;>^^>-s^^^^^ Upper quarries. JVangen. 



Moh^e.-y^y^^^^^^^^^^L^ Lower quarries. ^ 



River Rhine. 



• 



Environs de Paris, p. 307. 

 t Injustice to M. Brongniart it is right to state, that the quarries had not been worked for 

 some years previous to the period of his visit, and were probably then too much encumbered 

 with rubbish to admit of his making a satisfactory section. (See his observations, Env. dc Paris, 

 p. 308.) 



