Reviews. 1 61 



agrees rather with that of Lethen in Belgium, which belongs to 

 the lower portion of the Tongrian (Systeme Tongrien), and imme- 

 diately overlies the Systeme Laekenien, the uppermost of the five 

 Systems of Dumont just alluded to. Moreover, the occurrence 

 of this Fauna is as yet confined in North Germany to the country 

 west of the Elbe between Magdeburg, Calbe, and Egeln." 



The next fossiliferous bed in ascending order which occurs in 

 Northern Germany is the Septaria Clay of Berlin, which, with its 

 characteristic fossils, has hitherto been found near Stettin, Freien- 

 walde, Bukow, Hermsdorf, and Liibars near Berlin, Burg, 

 Holienwarthe on the Elbe below Magdeburg, and Gorzig near 

 Kothen. The same clay occurs in an isolated position in the 

 Liinebiirger Heath at Walle, near Celle, but it is not again met 

 with in a westerly direction nearer than Belgium, where the clay 

 of Boom Baesele and other places south of Antwerp is perfectly 

 identical. 



Professor Beyrich refers the Fauna of the Sternberger beds to 

 the same Belgian System (Systeme Rupelien). They contain the 

 characteristic shells of the Septaria clay, with others which are 

 not found in the older beds. It also occurs in the neighbourhood 

 of Stettin. The author is still uncertain whether any beds occur 

 in North Germany corresponding with the deposits of Kleyn- 

 Spawen, placed by Dumont between the Rupelmonde Clay and 

 that of Lethen, and which are referred partially to the Rupelmonde, 

 and partly to the Tongrian System. This is important because 

 these are the beds which, as De Koninek first suggested, have the 

 greatest analogy with those of the Mayence basin. 



All the tertiary deposits of the lower Elbe belong to a more 

 recent period, as well as those of other more northern localities 

 near Liineburg, Hamburg, and Holstein, and those of the island 

 Sylt and Schleswig. Of the same age are those observed by F. 

 Roemer on the frontier of Holland, and by Acfeld and Dusseldorf. 

 They must not, however, be placed higher than the deposits of 

 Bordeaux, the Touraine, Turin, and Vienna. Deposits of the age 

 of the clay of England and of Antwerp are altogether wanting in 

 North Germany. The youngest tertiary deposits of North Ger- 

 many belong to the Bolderberg System, which is placed by 

 Dumont and Lyell as parallel with the typical Miocene formations 

 of France and other countries, and of which, although inferior 

 to that of the Vienna basin, it is a better representation than the 

 Belgian deposit. 



After thus describing the physical characters of the North Ger- 

 man tertiary deposits, the author proceeds to discuss the question 

 as to where the boundary line is to be drawn between the Eocene 

 and Ivliocene formations in Belgium ; and after fairly stating the 

 views of Dumont, Lyell, and d'Orbigny, he appeals to the evidence 

 of North Germany, from which it appears that, in so far as the 



VOL. I. NO. I.— JAN. 1855. L 



