1854.] 



HAMILTON MAYENCE BASIN. 



291 



limestones may be traced at nearly the same level, following the sinu- 

 osities of the valleys, and appearing as beaches of the ancient sea ; 

 thus agreeing with what we have already seen to be the case in the 

 valleys of Switzerland. On the eastern side of the Rhine, where 

 volcanic outbursts of a more recent period are visible, the evidence is 

 not so conclusive ; but even here, tertiary beds of sandstone and 

 Molasse can be made out in various places, as at Heppenheim, be- 

 tween Darmstadt and Heidelberg, and further south near OflPenburg- 



IV. Extending our view to the other tertiary deposits round the 

 district we are examining, we meet with the interesting formations of 

 the Vienna Basin. The general character of most of the fossil 

 remains, — for they are said to belong to two periods, — which have been 

 found in this formation, to which the name of " Tegel " has been ap- 

 plied by the German geologists, and a list of the chief of which has 

 been published by the Imperial Geological Institute of Vienna, ap- 

 pears to be more recent than that of the Weinheim fossils. According 

 to Burmeister *, these middle tertiary formations extend in Germany 

 down the Valley of the Danube from the Lake of Constance to 

 Vienna, and stretch along the base of the Carpathian Mountains. 

 This author considers the Tegel formation to be nearly if not quite 

 contemporaneous with the Molasse and Nagel-fluhe of Switzerland. 



The following species are common to the lists published by the 

 Imperial Geological Institute and by Prof. Studer*!* as belonging 

 to the younger Molasse : — 



Conus Mercati, Brocchi. 

 Ancillaria glandiformis, Lam. 

 Mitra fusiformis, Brocchi. 

 Columbella carta, Bellardi. 



nassoides, Bellardi. 



Buccinum reticulatum, Grat. 



semistriatum, Broc. 



mutabile, Linn. 



baccatum, Basterot. 



Rostellaria pes-pelicani, Lam. 

 Ranella marginata, Lam. 

 Fusus burdigalensis, Grat. 

 Cancellaria cancellata, Lam. 

 Pleurotoma asperulata, Lam. 



pustulata, Broc. 



turricula, Broc. 



Cerithium margaritaceum, Lam. 

 scabrum, Desh. 



Turritella terebralis, Lam. 



Riepellii, Partsch. 



Trocbus patulus, Brocchi. 

 Sigaretus haliotoideus, Lam. 

 Natica millepunctata, Lam. 

 Crepidula unguiformis, Lam. 

 Mactra podolica, Eichwald. 

 Corbula revoluta, Broc. 

 Lucina divaricata, Lam. 

 Cytherea pedemontana, Jgassiz. 



erycinoides, Lam. 



multilamella, Lam. 



Venus plicata, Gmel. 

 Cardium Deshayesii, Payr. 

 Area barbata, Linn. 



diluvii, Lam. 



Pecten Solarium, Lam. 



Many other identities will probably be found to exist, when the 

 synonyms shall have been more carefully examined. Dr. Sandberger 

 informs me that he was much struck, on visiting the Vienna basin 

 last year, with the remarkable analogies between it and the upper 

 portions of the Mayence basin. 



V. The next tertiary deposit to which we must allude are the 



* Gesehichte der Schopfung, fourth edition, p. 275. 

 t Geol. Switzerland, vol. ii. 



