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INDEX
G
- Gasperian Stage
- Geneva Dolomite Member
- Genevievian Stage
- Gentry Coal Bed
- Gila Limestone Member
- Gimlet Sandstone Member
- Girardeau Limestone
- Glasford Formation
- Glen Dean Limestone
- Glen Park Formation
- Glenburn Till Member
- Glencoe Member
- Glenhaven Member
- Glenwood Formation
- Golconda Group
- Gordonville Member
- Goreville Limestone Member
- Grand Detour Formation
- Grand Tower Limestone
- Granger Sandstone Member
- Grassy Creek Shale
- Grassy Knob Chert
- Grayslake Peat
- Greenbush Coal Member or Bed
- Greenup Limestone Member
- Grigg tongue
- Grindstaff Sandstone Member
- Grove Church Shale
- Grover Gravel
- Gulfian Series
- Gunn Member
- Gunter Sandstone
- Guttenberg Formation
H
- Hadley Gravel Member
- Haeger Member
- Hagarstown Member
- Hall Limestone Member
- Haney Limestone
- Hannibal Shale
- Hanover Limestone Member
- Hardinsburg Sandstone
- Harkness Silt Member
- Harmattan Till Member
- Harmony Hill Shale Member
- Harrodsburg Limestone Member
- Hazel Green Member
- Hazelwood Member
- Hegeler Till Member
- Hely Member
- Hennepin Member
- Henry Formation
- Hermon Coal Member
- Herrin Coal Member
- Hillery Till Member
- Hoing Sandstone Member
- Holocene Series
- Hombergian Stage
- Houchin Creek Coal Member
- Howardton Limestone Member
- Hulick Till Member
- Hunton Limestone Megagroup
I
J
K
K cont.
- Kings Lake Formation
- Kinkaid Limestone
- Kiser Creek Member
- Knobs Megagroup
- Knox Dolomite Megagroup
- Kress Member
L
- La Salle Limestone Member
- Lacey Member
- Lacon Formation
- Lagonda Member
- 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
- Mackinaw Member
- Macoupin Limestone Member
- Mahomet Sand Member
- Malden Till Member
- Mammoth Cave Limestone Megagroup
- Manitowoc Member
- Manley Coal Member
- Maquoketa Shale Group
- Marcus Formation
- Markgraf Member
- Markham Silt Member
- Marywood Member
- Mascoutah facies
- 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
- Mooseheart Member
- Moredock Member
- Morrowan Series
- Mortimer Member
- Morton Tongue
- Mosalem Formation
- Mounds Gravel
- Mt. Carmel Sandstone Member
M cont.
- Mt. Rorah Coal Member
- Mt. Simon Sandstone
- Mulberry Grove Silt Member
- Murphysboro Coal Member
- Murray Bluff Sandstone Member
N
- Nachusa Formation
- Neda Formation
- Negli Creek Limestone Member
- New Albany Shale Group
- New Burnside Coal Member
- New Glarus Member
- New Haven Coal Member
- New London Member
- New Richmond Sandstone
- Niagaran Series
- Noix Oolite Member
- Nokomis Sandstone Member
- North Hill Group
- Nutwood Shale Member
O
- O'Nan Coal Member
- Oak Grove (Limestone) Member
- Oak formation
- Oakland Till Member
- Offerman Member
- Ogle Till Member
- Oglesby Member
- Okaw Group
- Omega Limestone Member
- Omphghent member
- Oneota Dolomite
- Opdyke Coal Member
- Orchard Creek Shale Member
- Ordovician System
- Otis Member
- Ottawa Limestone Megagroup
- Owl Creek Formation
P
- Paint Creek Group
- Paleocene Series
- Paleozoic Erathem
- Palestine Sandstone
- Pearl Formation
- Pecatonica Formation
- Peddicord Tongue
- Pennsylvanian Subsystem
- Peoria Silt
- Percy Limestone Member
- Petersburg Silt
- Peyton Colluvium
- Piasa Limestone
- Piatt Member
- Pike Soil
- Plaines Member
- Plano Silt Member
- Platteville Group
- Plattin Subgroup
- Pleasant Grove Soil
- Pleasantview Sandstone Member
- Pleistocene Series
- Pliocene Series
- Pokeberry Limestone Member
- Pond Creek Coal Member
- Popcorn Sandstone Member
- Pope Creek Coal Member
- Pope Megagroup
- Porters Creek Formation
- Post Creek Formation
- Potosi Dolomite
- Potsdam Sandstone Megagroup
- Pounds Sandstone Member
- Prairie du Chien Group
- Precambrian Erathem
- Prospect Hill Siltstone
- Proviso Siltstone Member
- Purington Shale Member
Q
R