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Showing below up to 50 results in range #71 to #120.
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- Guttenberg Formation
- Hannibal Shale
- Henry Formation
- Holocene Series
- Hombergian Stage
- Hunton Limestone Megagroup
- Ironton Sandstone
- Joachim Dolomite
- Joliet Formation
- Kankakee Formation
- Kaskaskia Sequence
- Keokuk Limestone
- Kewanee Group
- Kewaunee Formation
- Kimmswick Subgroup
- Kinderhookian Series
- Kings Lake Formation
- Kinkaid Limestone
- Knobs Megagroup
- Knox Dolomite Megagroup
- Lake Michigan Formation
- Lemont Formation
- Limestone
- Lingle Formation
- Lower Devonian Series
- Mammoth Cave Limestone Megagroup
- Maquoketa Shale Group
- Mason Group
- Mattoon Formation
- Maysvillian Stage
- Mazon Creek
- McCormick Group
- McLeansboro Group
- McNairy Formation
- Menard Limestone
- Mesozoic Erathem
- Middle Devonian Series
- Mifflin Formation
- Mississippian Subsystem
- Missourian Series
- Modesto Formation
- Morrowan Series
- Mounds Gravel
- Mt. Simon Sandstone
- Nachusa Formation
- New Albany Shale Group
- Niagaran Series
- Non-marine Sand, Clay, and Silt
- North Hill Group
- Okaw Group