PRIMARY, OR PALAiOZOIC, 
252 EXTINCT MONSTERS. 
Table of Stratified Rocks — Continued. 
.2 
Systems. 
Formations. 
PERMIAN or 
DYAS 
CARBONIFEROUS 
DEVONIAN & OLD 
RED SANDSTONE- 
SILURIAN 
ORDOVICIAN 
CAMBRIAN 
EOZOIC— 
ARCH.® AN 
( Red Sandstone, Marl \ Zech- 
Magnesian Limestone, etc. / stein 
Red Sandstone and Conglomerate 
Rothliegende 
I Coal Measures and Millstone Grit 
\ Carboniferous Limestone Series 
( Upper Old Red Sandstone 
Devonian 
Lower Old Red Sandstone 
f Ludlow Series 
Wenlock Series 
Llandovery Series 
May Hill Series 
( Bala and Caradoc Series 
Llandeilo Series 
Llanvirn Series 
Arenig and Skiddaw Series 
{ Tremadoc Slates 
Lingula Flags 
Menevian Series 
Harlech and Longmynd Series 
( Pebidian, Arvonian, and Dimetian 
i Huronian and Laurentian 
Dominant 
type. 
Fishes 
Dominant 
type, In- 
vertebrata 
