3. Newer Pliocene. } Pliocene. } 4. Older Pliocene. } } } 5. Upper Miocene. } Miocene. } Tertiary } 6. Lower Miocene. } } or } } Cainozoic. } 7. Upper Eocene. } } } 8. Middle Eocene. } Eocene. } } 9. Lower Eocene. } } } } Neozoic. 10. Maestricht Beds. } } } 11. White Chalk. } } } 12 Chloritic Series. } } Secondary } 13. Gault } Cretaceous. } or } 14. Neocomian. } } Mesozoic. } 15. Wealden. } } } 16. Purbeck Beds. } } } 17. Portland Stone. } } } 18. Kimmeridge Clay. } } } 19. Coral Rag. } Jurassic. } } 20. Oxford Clay. } } Secondary } 21. Great or Bath Oolite. } } or } Neozoic. 22. Inferior Oolite. } } Mesozoic. } 23. Lias. } } } } } 24. Upper Trias. } } } 25. Middle Trias. } Triassic. } } 26. Lower Trias. } } } 27. Permian. Permian. } 28. Coal Measures. } } 29. Carboniferous } Carboniferous. } limestone. } } } 30. Upper } { Devonian or } 31. Middle } Devonian. { Old Red } } 32. Lower } { Sandstone. } Primary } } or } Palæozoic. 33. Upper } } Palæozoic. } 34. Lower } Silurian. Silurian. } } 35. Upper } } 36. Lower } Cambrian. Cambrian. } } 37. Upper } } 38. Lower } Laurentian. Laurentian. } NATURAL ORDERS TO WHICH FOSSIL PLANTS BELONG.