By J. Green. 
THE EARTH’S STRATA. 
In this plate are shewn the deposits of successive ages which have combined to form the Earth’s Crust. They are—I, Pleistocene; 
2. Pliocene; 3. Miocene; 4. Oligocene; 5. Eocene; 6. Cretaceous; 7. Neocomian; 8. Upper Jurassic; 9. Middle Jurassic; 10. Lower 
Jurassic; 11. Trias; 12 Permian; 13. Carboniferous; 14. Devonian and Old Red Sandstone; 15. Silurian; 16. Ordovician: 
17. Cambrian; 18. Algonkian (Keweenawan); 19. Algonkian (Upper Huronian); 20. Algonkian (Lower Huronian); 21. Archaean. 
