252 EXTINCT MONSTERS. 



Table of Stratified Rocks — Continued. 



Systems. 



Formations. 



N 

 O I 



'^\ 



•-1 



**' 



Ah I 



o 



> 



Pi 



< 



Cm 



PEKMIAN or 

 DYAS 



CAEBONIFEROUS { 



DEVONIAN & OLD I 

 EED sandstone) 



SILUEIAN \ 



OEDOVICIAN 



CAMBETAN 



EOZOIC— 



aech.£:an 



Red Sandstone, Marl \ Zech- 



Magnesian Limestone, etc. / stein 

 Red Sandstone and Conglomerate 



Rothliegende 

 Coal Measures and Millstone Grit 

 Carboniferous Limestone Series 

 Upper Old Red Sandstone 

 Devonian 



Lower Old Red Sandstone 

 Ludlow Series 

 VVeniock Series 

 Llandovery Series 

 May Hill Series 

 Bala and Caradoc Series 

 Llandeilo Series 

 Llanvirn Series 

 Arenig and Skiddavv Series 

 Tremadoc Slates 

 Lingula Flags 

 Menevian Series 

 Harlech and Longmynd Series 



Dominant 

 type, 

 Fishes 



Pebidian, Arvonian, and Dimetian 

 Huronian and Laurentian 



Dominant 

 type, In- 

 vertebrata 



