Search:Ordovician System

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Read about the Ordovician System
Cincinnatian SeriesChamplainian SeriesCanadian SeriesSauk SequenceKnox Dolomite Megagroup2Prairie du Chien GroupShakopee DolomiteNew Richmond SandstoneOneota DolomiteGunter SandstoneBlodgett MemberEverton DolomiteChazyan StageBlackriveran StageTrentonian StageEdenian StageMaysvillian StageRichmondian StageTippecanoe SequenceHunton_Limestone MegagroupOttawa_Limestone MegagroupMaquoketa Shale GroupGalena GroupPlatteville_GroupAncell GroupKimmswick SubgroupDecorah SubgroupPlattin SubgroupNeda FormationBrainard ShaleFort Atkinson LimstoneScales ShaleCape LimestoneDubuque FormationDunleith FormationGuttenberg FormationSpechts Ferry FormationQuimbys Mill FormationNachusa FormationGrand Detour FormationMifflin FormationPecatonica FormationSt. Peter SandstoneClermont Shale MemberGirardeau LimestoneScales ShaleOrchard Creek Shale MemberThebes Sandstone MemberCape LimestoneWise Lake FormationStewartville MemberSinsinawa MemberNew London MemberDunleith FormationSherwood MemberRivoli MemberFairplay MemberEagle Point MemberEagle Point MemberBeecher MemberBeecher MemberSt.James MemberSt. James MemberBuckhorn MemberBuckhorn MemberMincke MemberTyson_MemberKings Lake FormationGarnavillo MemberGarnavillo MemberGlenhavenMemberGlenhaven MemberGuttenberg FormationGlencoe MemberCastlewood MemberCastlewood MemberGlencoe MemberStrawbridge MemberShullsburg MemberHazel Green MemberEverett MemberElm MemberEldena MemberForrestonMemberVictory MemberHely MemberClement MemberStillman MemberWalgreen MemberDement MemberBriton MemberHazelwood MemberEstablishment MemberBrickeys MemberBlomeyer MemberOglesby MemberMedusa MemberNew Glarus MemberDane MemberChana MemberHennepin MemberJoachim DolomiteHarmony Hill Shale MemberMetz MemberLoughridge Sandstone MemberMatson MemberNokomis Sandstone MemberDaysville Dolomite MemberDefianceMemberKingdom Sandstone MemberBoles MemberAugusta MemberAbernathy MemberDutchtown LimestoneSharpsboro MemberGordonville MemberStarved_Rock Sandstone MemberTonti Sandstone MemberKress MemberArsenal MemberSpechts_Ferry_FormationFigure O-4 imagemap.jpg
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Stratigraphic column is from ISGS Bulletin 95 (1975).

Ordovician‏ System
  1. Tippecanoe Sequence
  2. Ordovician System
  3. Cincinnatian Series
  4. Richmondian Stage
  5. Maquoketa Shale Group
  6. Neda Formation
  7. Brainard Shale
  8. Girardeau Limestone
  9. Fort Atkinson Limstone
  10. Scales Shale
  11. Clermont Shale Member
  12. Maysvillian Stage
  13. Elgin Shale Member
  14. Edenian Stage
  15. Orchard Creek Shale Member
  16. Thebes Sandstone Member
  17. Ottawa Limestone Megagroup
  18. Cape Limestone
  19. Champlainian Series
  20. Trentonian Stage
  21. Galena Group
  22. Dubuque Formation
  23. Kimmswick Subgroup
  24. Wise Lake Formation
  25. Stewartville Member
  26. Sinsinawa Member
  27. Dunleith Formation
  28. Wyota Member
  29. New London Member
  30. Wall Member
  31. Sherwood Member
  32. Moredock Member
  33. Rivoli Member
  34. Mortimer Member
  35. Fairplay Member
  36. Eagle Point Member
  37. Beecher Member
  38. St. James Member
  39. Buckhorn Member
  40. Decorah Subgroup
  41. Guttenberg Formation
  42. Glenhaven Member
  43. Garnavillo Member
  44. Kings Lake Formation
  45. Tyson Member
  46. Mincke Member
  47. Spechts Ferry Formation
  48. Glencoe Member
  49. Castlewood Member
  50. Blackriveran Stage
  51. Platteville Group
  52. Plattin Subgroup
  53. Quimbys Mill Formation
  54. Strawbridge Member
  55. Shullsburg Member
  56. Hazel Green Member
  57. Nachusa Formation
  58. Everett Member
  59. Elm Member
  60. Eldena Member
  61. Grand Detour Formation
  62. Forreston Member
  63. Victory Member
  64. Hely Member
  65. Clement Member
  66. Stillman Member
  67. Walgreen Member
  68. Dement Member
  69. Mifflin Formation
  70. Briton Member
  71. Hazelwood Member
  72. Establishment Member
  73. Brickeys Member
  74. Blomeyer Member
  75. Pecatonica Formation
  76. Oglesby Member
  77. Medusa Member
  78. New Glarus Member
  79. Dane Member
  80. Chana Member
  81. Hennepin Member
  82. Ancell Group
  83. Glenwood Formation
  84. Joachim Dolomite
  85. Harmony Hill Shale Member
  86. Metz Member
  87. Loughridge Sandstone Member
  88. Matson Member
  89. Nokomis Sandstone Member
  90. Daysville Dolomite Member
  91. Defiance Member
  92. Kingdom Sandstone Member
  93. Boles Member
  94. Augusta Member
  95. Abernathy Member
  96. Dutchtown Limestone
  97. Sharpsboro Member
  98. Gordonville Member
  99. St. Peter Sandstone
  100. Starved Rock Sandstone Member
  101. Tonti Sandstone Member
  102. Kress Member
  103. Sauk Sequence
  104. Chazyan Stage
  105. Everton Dolomite
  106. Canadian Series
  107. Prairie du Chien Group
  108. Shakopee Dolomite
  109. New Richmond Sandstone
  110. Oneota Dolomite
  111. Blodgett Member
  112. Arsenal Member
  113. Gunter Sandstone