262 



T. Davidson — Continental Geology. 



Zone of Ammonites Nisus. 





Zone of Ammonites Mar- 

 tini. 



Olhey, not far from Goslar, Frankenmuhle, near 

 Aahans, in "Westphalia. 



Calcareous Clay (Gargas-Marl) : Mastbruch, near 

 Brunswick. 



Zone of Belemnites Bruns- 

 wicensis. 



(Speeton Clay) Moorhutte, near Brunswick, Heli- 

 goland. 



Zone of Crioceras Erne- 

 rici. 



Bohnencamp near Querum, not far from Brunswick. 



Zone of Ostrea Couloni 

 var. Aquila, 



S H 



Clay, ex- 

 tending 

 between 

 Asse and 

 Elm. 



Ironstone 



near 

 Salzgritter. 



Beds of EUiffser-brinke. 



Sandstone 



of the 

 Teutobur- 

 ger Walde. 



Lower 

 Greensand 



? 



?. Zone of Toxaster Compla- 



g; natus. 



Tackwelle near Berklin- 



gen in the Asse. 

 (Marnes d' Hauterive). 



Gross Vahlberg in the 

 Asse (Valanginien ?) 



"Wealden formation. 



Note. — The " Hils " is a range of lofty hUls lying "to the south-west of Alfeld, in 

 Hanover. The " Elm " and the " Asse " are two Ranges of Hills near Schoppenstedt, 

 in Brunswick. 



In order to render M. Von Strombeck's table more clear to the 

 English student, Mr. Judd has kindly, at my request, drawn up the 

 following few notes on the comparison of the English and German 

 Cretaceous, but intimates, at the same time, that this important 

 subject requires ample discussion rather than categorical statement. 



" The Mesozoic strata of north-western Germany and those of the 

 north of England present many very interesting points of analogy, 

 which perhaps point to the conclusion that both were deposited in 

 the same hydrographical basin. 



"Unfortunately the Chalk of the north of England has not yet 

 been studied in sufficient detail to enable us to determine how far 

 the palaeontological classification, proposed by M. Von Strombeck, 

 may be applicable to it. One very interesting point of resemblance, 

 however, between the North-German Chalk and that of the ]S"orth 

 of England is the occurrence in both of beds of a red colour. It is 

 in the middle Cretaceous that we find the most striking differences 

 in the two series. This division is represented in the North of 

 England by the thin formation of the red limestone of Hunstanton ; 

 while in Germany we find various beds of Clay of considerable 

 thickness, the most important of which (from a fancied resemblance 

 of its variegated markings to flames) is called the ' Flammenmergel.' 

 The two zones classed by M. Von Strombeck as Lower Gault are 

 not known in the western part of the North-German area ; in England 

 they are equally wanting, and it is not improbable that they repre- 



