KAINOZOIC. 
MESOZOIC. 
PALAZOZOIC. 
CHRONOLOGICAL SUCCESSION. A3 
IDEAL SECTION OF THE CRUST OF THE EARTH. 
Fig. 17. 
Yo Post-tertiary and Recent. 
|} Pliocene. 
Eocene. 
—— == Cretaceous. 
Oolitic or Jurassic. 
Triassic. 
Ce ee 
Permian. 
Carboniferous. 
Devonian or Old Red Sandstone. 
= 
=|. 
, 
| 
° 4400002900550 
Om) (9) 0' co 
Cambrian. 
Huronian. 
Laurentian. 
