1. RECENT. } POST-TERTIARY. 2. POST-PLIOCENE. } } 3. NEWER PLIOCENE. } PLIOCENE. } 4. OLDER PLIOCENE. } } } TERTIARY 5. UPPER MIOCENE. } MIOCENE. } or 6. LOWER MIOCENE. } } CAINOZOIC. } 7. _a_ UPPER EOCENE. } EOCENE. } 7. _b_ MIDDLE EOCENE. } } 8. LOWER EOCENE. } } 9. MAESTRICHT BEDS. } 10. UPPER WHITE CHALK. } 11. LOWER WHITE CHALK. } 12. UPPER GREENSAND. } CRETACEOUS. } 13. GAULT. } } 14. LOWER GREENSAND. } } 15. WEALDEN. } } } 16. PURBECK BEDS. } } 17. PORTLAND STONE. } } SECONDARY 18. KIMMERIDGE CLAY. } } or 19. CORAL RAG. } JURASSIC } MESOZOIC. 20. OXFORD CLAY. } } 21. GREAT or BATH OOLITE. } } 22. INFERIOR OOLITE. } } 23. LIAS. } } } 24. UPPER TRIAS. } } 25. MIDDLE TRIAS, } } or } TRIASSIC. } MUSCHELKALK. } } 26. LOWER TRIAS. } } 27. PERMIAN, } or } PERMIAN. } MAGNESIAN LIMESTONE. } } } 28. COAL-MEASURES. } } 29. CARBONIFEROUS } CARBONIFEROUS. } LIMESTONE. } } } PRIMARY 30. UPPER DEVONIAN. } DEVONIAN, or } or 31. LOWER " } OLD RED SANDSTONE. } PALÆOZOIC. } 32. UPPER SILURIAN. } SILURIAN. } 33. LOWER " } } } 34. UPPER CAMBRIAN. } CAMBRIAN. } 35. LOWER " } } * * * * * Transcriber Note Minor typos corrected. Some images moved to nearest paragraph break. A paragraph break was added to page 74 and 105 to accommodate placement of Figures 17 and 26 respectively. The missing anchor for the footnote on page 199 was added.