Search results

• Clermont Shale Member
  |category5=Maquoketa Shale Group |tree1=Maquoketa Shale Group
  2 KB (247 words) - 16:25, 12 January 2017
• Historical:Dubuque Formation
  |tree2=Galena Group |category7=Galena Group
  3 KB (430 words) - 17:32, 8 December 2016
• Girardeau Limestone
  |category5=Maquoketa Shale Group |tree1=Maquoketa Shale Group
  4 KB (482 words) - 16:13, 12 January 2017
• Historical:Wilhelmi Formation
  ...much as 100 feet thick where it fills deep channels in the Maquoketa Shale Group, but it is thin or absent in other areas. It is absent in southern Illinois ...shale is difficult to differentiate from shale of the underlying Maquoketa Group, but the latter generally is greenish gray.
  3 KB (399 words) - 23:47, 4 January 2017
• Thebes Sandstone Member
  |category5=Maquoketa Shale Group |tree1=Maquoketa Shale Group
  3 KB (376 words) - 16:33, 12 January 2017
• Historical:Moredock Member
  |tree2=Galena Group |category7=Galena Group
  2 KB (286 words) - 17:28, 13 December 2016
• Orchard Creek Shale Member
  |category5=Maquoketa Shale Group |tree1=Maquoketa Shale Group
  3 KB (410 words) - 16:33, 12 January 2017
• Dubuque Formation
  |category7=Galena Group |tree2=Galena Group
  4 KB (504 words) - 16:47, 12 January 2017
• Wilhelmi Formation
  ...much as 100 feet thick where it fills deep channels in the Maquoketa Shale Group, but it is thin or absent in other areas. It is absent in southern Illinois ...shale is difficult to differentiate from shale of the underlying Maquoketa Group, but the latter generally is greenish gray.
  3 KB (471 words) - 00:10, 5 January 2017
• Historical:Ottawa Limestone Megagroup
  ...dolomite Dutchtown and Joachim Formations in the upper part of the Ancell Group. At the base in northern Illinois it locally includes the Daysville Dolomit
  2 KB (297 words) - 20:57, 7 December 2016
• Historical:Hunton Limestone Megagroup
  ...quoketa Shale Group) and the late Devonian clastic rocks (New Albany Shale Group) at the base of the overlying Knobs Megagroup (fig. 14). In local areas, si ...truncates the Hunton Megagroup and rests on the Ordovician Maquokota Shale Group.
  3 KB (455 words) - 14:51, 10 January 2017
• Historical:Galena Group
  |tree2=Galena Group |category7=Galena Group
  5 KB (726 words) - 16:41, 12 January 2017
• Historical:Dutchtown Limestone
  |tree2=Ancell Group |category6=Ancell Group
  3 KB (396 words) - 15:56, 21 December 2016
• Moredock Member
  |category7=Galena Group |tree2=Galena Group
  3 KB (359 words) - 16:57, 12 January 2017
• Historical:Alexandrian Series
  ...(fig. S-14) and, where they fill erosional channels in the Maquoketa Shale Group, are locally as much as 150 feet thick.
  3 KB (403 words) - 20:48, 4 January 2017
• Hunton Limestone Megagroup
  ...quoketa Shale Group) and the late Devonian clastic rocks (New Albany Shale Group) at the base of the overlying Knobs Megagroup (fig. 14). In local areas, si ...truncates the Hunton Megagroup and rests on the Ordovician Maquokota Shale Group.
  4 KB (530 words) - 17:24, 11 January 2017
• Galena Group
  |category7=Galena Group |tree2=Galena Group
  6 KB (813 words) - 20:45, 22 October 2019
• Ottawa Limestone Megagroup
  ...dolomite Dutchtown and Joachim Formations in the upper part of the Ancell Group. At the base in northern Illinois it locally includes the Daysville Dolomit
  3 KB (372 words) - 16:34, 12 January 2017
• Historical:Fern Glen Formation
  ...Limestone to rest on truncated older rocks, as old as the Maquoketa Shale Group. It grades vertically and laterally into the overlying Burlington Limestone
  3 KB (418 words) - 21:43, 18 January 2017
• Dutchtown Limestone
  |category6=Ancell Group |tree2=Ancell Group
  4 KB (466 words) - 18:34, 12 January 2017

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