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Showing below up to 50 results in range #1 to #50.

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  1. Paleozoic Erathem‏‎ (917 members)
  2. Bulletin 95‏‎ (500 members)
  3. Pennsylvanian Subsystem‏‎ (308 members)
  4. Absaroka Sequence‏‎ (305 members)
  5. Tippecanoe Sequence‏‎ (272 members)
  6. Kaskaskia Sequence‏‎ (241 members)
  7. Ordovician System‏‎ (227 members)
  8. Cenozoic Erathem‏‎ (227 members)
  9. Quaternary System‏‎ (210 members)
  10. Pleistocene Series‏‎ (179 members)
  11. Mississippian Subsystem‏‎ (178 members)
  12. Limestone‏‎ (174 members)
  13. Champlainian Series‏‎ (174 members)
  14. Desmoinesian Series‏‎ (170 members)
  15. Ottawa Limestone Megagroup‏‎ (164 members)
  16. Kewanee Group‏‎ (140 members)
  17. McLeansboro Group‏‎ (120 members)
  18. Hunton Limestone Megagroup‏‎ (112 members)
  19. Coal‏‎ (112 members)
  20. Blackriveran Stage‏‎ (108 members)
  21. Pope Megagroup‏‎ (96 members)
  22. Devonian System‏‎ (84 members)
  23. Chesterian Series‏‎ (80 members)
  24. Sandstone‏‎ (79 members)
  25. Carbondale Formation‏‎ (78 members)
  26. Sauk Sequence‏‎ (76 members)
  27. Missourian Series‏‎ (74 members)
  28. Valmeyeran Series‏‎ (70 members)
  29. Producing Zones and Informal Names‏‎ (68 members)
  30. Mammoth Cave Limestone Megagroup‏‎ (68 members)
  31. Cambrian System‏‎ (66 members)
  32. Silurian System‏‎ (62 members)
  33. Platteville Group‏‎ (62 members)
  34. Spoon Formation‏‎ (60 members)
  35. Trentonian Stage‏‎ (60 members)
  36. Croixan Series‏‎ (60 members)
  37. Bulletin 94‏‎ (58 members)
  38. Knox Dolomite Megagroup‏‎ (58 members)
  39. Galena Group‏‎ (56 members)
  40. Middle Devonian Series‏‎ (50 members)
  41. Modesto Formation‏‎ (46 members)
  42. Shale‏‎ (46 members)
  43. Plattin Subgroup‏‎ (46 members)
  44. Ancell Group‏‎ (42 members)
  45. Elviran Stage‏‎ (38 members)
  46. Mattoon Formation‏‎ (38 members)
  47. Kimmswick Subgroup‏‎ (36 members)
  48. Alexandrian Series‏‎ (34 members)
  49. McCormick Group‏‎ (32 members)
  50. Embayment Megagroup‏‎ (32 members)

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