CKETACEOUS GROUP. 



37 



SECONDARY SERIES. 



CRETACEOUS GROUP. 

 YTEALDEN GROUP. 

 OOLITIC GROUP. 



NEW RED SANDSTONE OR 

 TRIASSIC GROUP. 



CRETACEOUS GROUP. 



K»gtiA jMtim. Fremtk Jntkon. Roemer. I/OrUfr. 



(Chalk with flint* . . Ct«ie ObereKreide . . L'etage Senonim. 



Chalk without flints . Cntere Kteide 



Chalk marl .... CiaieTufan . . . Planer ... -i 



rUpper Green Sand . Glaaconie Crajeoae Gronaand . . i 



gj Ganlt Gait 



* i r Quader . . . -i f A; 



J Lower Green Sand . Glauconie sablenae J \ \ 



<-> \ I HiUconglomerat > >• Ji 



TmonieD. 



Albien. 

 AptiCD. 

 irofoniifii. 



ALTHOUGH the subordinate beds of this group present 

 many distinctive characters, still they form but portions 

 of one continuous series, as evinced by their organic con- 

 tents ; and for the sake of convenience, we have classed 

 the fossils together, from the Chalk to the Lower Green 

 Sand, inclusive. This group is composed chiefly of 

 cretaceous, argillaceous and arenaceous beds, the former 

 predominating in the upper and the two latter in the 

 lower division. 



The White Chalk, a nearly pure carbonate of lune with, 

 minute fi*agments of Shells and Foraminifera, has usually 

 been divided into two parts, the Upper Chalk being cha- 

 racterized by the presence of flint nodules, more or less^ 

 horizontally arranged; and the Lower Chalk, which is» 



