STRATA 

1. Recent Deposits  
T E R T I A R Y 
2. Pliocene  
3. Miocene.  
4. Eocene  
S E C O N D A R Y 
5. Cretaceous  
6. Oolitic  
7. Lias  
8. Triassic  
P R I M A R Y 
9. Permian  
10. Carboniferous  
11. Devonian  
12. Silurian  
13. Cambrian  
14. Laurentian 
CHARACTERISTICS FOSSIL REMAINS 

1. Recent Deposits. Irish Elk 

2. Pliocene. Mastodon. 

3. Miocene. (1) Cerithium. (2) Segnoia. 

4. Eocene. (1) Nummulites. (2) Natica. 

5. Cretaceous. (1) Inoceramus. (2) Turrilites. (3) Pecten. (4) Hamites. 

6. Oolite. (1) Pholadomya. (2) Trigonia. (3) Mantellia. (4) Nerinæa. 

7. Lias. (1) Icthyosaurus. (2) Ammonites. 

8. Triassic. (1) Labyrinthodon. (2) Encrinus. 

9. Permian. (1) Bakewellia. (2) Productus. (3) Palæoniscus. 

10. Carboniferous. (1) Goniatites. (2) Lepidodendron. (3) Calamites. 

11. Devonian. (1) Pterichthys. 

12. Silurian. (1) Goniatites. (2) Lepidodendron. (3) Calamites. 

13. Cambrian. (1 Strophomena. (2) Lingula. (3) Pentamerus. (4) Calymene. 

14. Laurentian. (1) Oldhamia. 