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INDEX
H
I
J
K
- Kankakee Formation
- Karnak Limestone Member
- Kaskaskia Sequence
- Kellerville Till Member
- Kenwood Member
- Kenyon Member
- Keokuk Limestone
- Kerton Creek coal bed
- Kewanee Group
- Kewaunee Formation
- Kidd Member
- Kimmswick Subgroup
- Kinderhookian Series
- Kingdom Sandstone Member
- Kings Lake Formation
- Kinkaid Limestone
- Kiser Creek Member
- Knobs Megagroup
- Knox Dolomite Megagroup
- Kress Member
L
L cont.
- Lake Creek Coal Member
- Lake Michigan Formation
- Lake Michigan Member
- Lawson Shale Member
- Lee Center Till Member
- Lemont Formation
- Levias Limestone Member
- Levings Member
- Lierle Clay Member
- Lingle Formation
- Litchfield Coal Member
- Little Bear Soil
- Little Vermilion Limestone Member
- Livingston Limestone Member
- Lombard Dolomite Member
- Lonsdale Limestone Member
- Loughridge Sandstone Member
- Louisiana Limestone
- Loveland Silt
- Lovell Member
- Lower Devonian Series
M
M cont.
- Mason Group
- Matson Member
- Mattoon Formation
- Mayfield Member
- Maysvillian Stage
- McCleary's Bluff Coal Member
- McCraney Limestone
- McDonough Loess Member
- McLeansboro Group
- McNairy Formation
- McWain Sandstone Member
- Meadow Loess Member
- Mecca Quarry Shale Member
- Medusa Member
- Menard Limestone
- Meppen Limestone
- Merom Sandstone Member
- Mesozoic Erathem
- Metropolis Formation
- Metz Member
- Middle Devonian Series
- Mifflin Formation
- Millersville Limestone Member
- Mincke Member
- Misenheimer Shale Member
- Mississippian Subsystem
- Missourian Series
- Moccasin Springs Formation
- Modern Soil
- Modesto Formation
- Momence Sandstone Member
- Montrose Chert Member