ANNIVERSARY ADDRESS OF THE PRESIDENT. IxXXV 



the fossils of the Alzey marine beds to those of Hesse-Cassel and Mag- 

 deburg, and others, that there was any direct communication between 

 the two seas. The Gulf of Alzey he considers to have been probably 

 in immediate connexion with the Mediterranean or Southern Ocean ; 

 he suggests that the molasse of Switzerland may have formed a portion 

 of the same formation, and that its waters did not extend northwards 

 of the Taunus and the Hundsriick. The marine beds of Cassel, on 

 the other hand, belonged to the southern prolongation of a northern 

 ocean. Considering the large number of fossils in these Alzey beds, 

 which have been identified with those of the North of Germany and 

 of Belgium, I think this complete separation is somewhat doubtful. 



The following table appended to the memoir will show how Prof. 

 Ludwig arranges chronologically the different tertiary formations of 

 Germany : — 



A. Pliocene. 



Basalt clay ; brown •coals of Dorheim and Annerod. 



B. Miocene. 



1. Systeme Bolderien of Belgium. The dark sandy clays of Winters- 

 wick in Holland; near Bockliolt in Westphalia; from Celle near 

 Giistitz, north of Perleberg in Preignitz. Wanting in Hesse and on 

 the Rhine. 



2. Steinberg shell-sand, marine sand of Crefeld, Osnabriick, Biinde, 

 Hildesheim, Alfeld, Luithorst, Guntersen, from Reinhardswald, 

 Hesse Cassel, and Wilhelmshohe. 



3. Systeme rupelien superieur. Clays of Boom, septaria-clay of Celle, 

 Hohenwarth near Magdeburg. Gorzig near Kothen, Hermsdorf, 

 Freienwalde, Bukow, Joacbimsthal, Stettin, Oberkaufungen Neu- 

 stadt, Eckardroth. 



Brackish and freshwater formations of the same age. Leaf-sand- 

 stone partly, Littorinella-limestone, blue clay, the most recent brown- 

 coal formation of the Vogelsberg. 



4. Systeme rupelien inferieur. Marine. Pectunculus-bed of Bergen 

 in Belgium, Alzey sands. Sandstone with Ostrea longirostris of 

 Bad Sulz, marine molasse of Switzerland. 



Brackish and freshwater formations. Cyrena-rndxX, Cerithium- 

 beds with brown-coal and impressions of leaves (leaf-bearing sand- 

 stone in part) from the Ilhine-Wetterau basin ; clays with Cerithium, 

 Littorinella, and Melania ; brown-coals of Lower Hesse as far as the 

 neighbourhood of Marburg. 



The second paper contains a list of all the tertiary fossils found in 

 the Wetterau arranged stratigraphically, and describes the relations 

 of the different formations in which they occur. This paper is also 

 one of great merit, and, in recommending it to the notice of tertiary 

 geologists, I will only observe that I cannot find any satisfactory 

 reason for considering the Cyrena-msirls and Cerithium-heds to be of 

 the same age as the marine sands of Alzey. There can be no doubt 

 that near Weinheim and Alzey, the blue clays with Cerithium and 

 Cyrena overlie the marine sands of Alzey, and I do not understand 

 why Prof. Ludwig should assume a different chronology with respect 

 to the beds of the Wetterau where the marine sands do not occur. 



The Imperial Geological Institute of Vienna has, on the occasion 

 VOL. XII. g 



