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This category has the following 4 subcategories, out of 4 total.
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The following 2 pages are in this category, out of 2 total.
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163:This list may not reflect recent changes
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16:The main article for this
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78:Ordovician fossil record
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122:Ordovician magmatism
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206:Ordovician
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126:(1 C, 5 P)
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187:Avalonia
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