1. RECENT.
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POST-TERTIARY.
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2. POST-PLIOCENE.
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3. NEWER PLIOCENE.
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PLIOCENE.
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TERTIARY or CAINOZOIC.
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NEOZOIC.
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4. OLDER PLIOCENE.
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5. UPPER MIOCENE.
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MIOCENE.
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6. LOWER MIOCENE.
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7. UPPER EOCENE.
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EOCENE.
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8. MIDDLE EOCENE.
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9. LOWER EOCENE.
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10. MAESTRICHT BEDS.
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CRETACEOUS.
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SECONDARY or MESOZOIC.
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11. UPPER WHITE CHALK.
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12. LOWER WHITE CHALK.
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13. UPPER GREENSAND.
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14. GAULT.
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15. LOWER GREENSAND.
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16. WEALDEN.
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17. PURBECK BEDS.
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JURASSIC.
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18. PORTLAND STONE.
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19. KIMMERIDGE CLAY.
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20. CORAL RAG.
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21. OXFORD CLAY.
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22. GREAT or BATH OOLITE.
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23. INFERIOR OOLITE.
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24. LIAS
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25. UPPER TRIAS.
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TRIASSIC.
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26. MIDDLE TRIAS, or MUSCHELKALK.
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27. LOWER TRIAS
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28.PERMIAN, or MAGNESIAN LIMESTONE
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PERMIAN.
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PRIMARY or PALEOZOIC.
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PALEOZOIC.
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29. COAL-MEASURES.
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CARBONIFEROUS.
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30. CARBONIFEROUS LIMESTONE.
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31. UPPER
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DEVONIAN.
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DEVONIAN.
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32. LOWER
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33. UPPER
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SILURIAN.
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SILURIAN.
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34. LOWER
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35. UPPER
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CAMBRIAN.
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CAMBRIAN.
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36. LOWER
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