100 



CHRONOLOGICAL ARRANGEMENT. 



[Ch. IX. 



Fossiliferous Strata of Western Europe divided into Eight Groups. 



1. Post-Tertiary and Ter- 



tiary - 



2. Cretaceous 



3. Oolitic - 



4. Triassic - 



5. Permian and Carboni- 



ferous - - 



6. Devonian or Old Red 



Sandstone - 



7. Silurian - 



8. Cambrian 



from the Recent to the Eocene inclusive. 



from the Maestricht Chalk to the Wealden inclu- 

 sive. 



from the Purbeck to the Lias inclusive. 



including the Keuper, Muschelkalk, and Bunter- 

 Sandstein of the Germans. 



including Magnesian Limestone, Coal Measures, 

 and Mountain Limestone. 



from the Yellow Sandstone of Fife to the Forfar- 

 shire paving stones with cephalaspis. 



from the Upper Ludlow to the Bala Limestone, 

 and Graptolite Schists. 



from the Lingula flags or primordial zone of Bar- 

 rande to the lowest known fossiliferous rocks. 



But the following more detailed list of fossiliferous strata, divided 

 into a greater number of sections, will be found useful by the reader 

 when he is studying our descriptions of the sedimentary formations 

 given in the next 18 chapters. 



