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The following 4 pages are in this category, out of 4 total.
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17:Pages in category "Ordovician South Dakota"
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83:Ordovician United States
88:Paleozoic South Dakota
64:Whitewood Limestone
52:St. Peter Sandstone
35:Deadwood Formation
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40:Decorah Shale
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77:Categories
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59:W
47:S
30:D
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