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Showing below up to 50 results in range #1 to #50.
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- Paleozoic Erathem (925 members)
- Bulletin 95 (500 members)
- Pennsylvanian Subsystem (316 members)
- Absaroka Sequence (313 members)
- Tippecanoe Sequence (272 members)
- Kaskaskia Sequence (241 members)
- Ordovician System (227 members)
- Cenozoic Erathem (217 members)
- Quaternary System (200 members)
- Mississippian Subsystem (178 members)
- Desmoinesian Series (178 members)
- Pleistocene Series (177 members)
- Limestone (176 members)
- Champlainian Series (174 members)
- Ottawa Limestone Megagroup (164 members)
- McLeansboro Group (120 members)
- Hunton Limestone Megagroup (112 members)
- Coal (112 members)
- Circular 605 (111 members)
- Blackriveran Stage (108 members)
- Kewanee Group (103 members)
- Pope Megagroup (96 members)
- Carbondale Formation (95 members)
- Devonian System (84 members)
- Chesterian Series (80 members)
- Sandstone (77 members)
- Producing Zones and Informal Names (76 members)
- Sauk Sequence (76 members)
- Missourian Series (74 members)
- Valmeyeran Series (70 members)
- Mammoth Cave Limestone Megagroup (68 members)
- Cambrian System (66 members)
- Silurian System (62 members)
- Platteville Group (62 members)
- Trentonian Stage (60 members)
- Croixan Series (60 members)
- Knox Dolomite Megagroup (58 members)
- Bulletin 94 (57 members)
- Galena Group (56 members)
- Spoon Formation (51 members)
- Middle Devonian Series (50 members)
- Shale (49 members)
- Modesto Formation (46 members)
- Plattin Subgroup (46 members)
- Ancell Group (42 members)
- Elviran Stage (38 members)
- Mattoon Formation (38 members)
- Kimmswick Subgroup (36 members)
- Alexandrian Series (34 members)
- McCormick Group (32 members)