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This category contains events which happened in the Ordovician, a division of the geologic time scale. See geologic time scale for information about its divisions and how they relate to each other.
This category has the following 9 subcategories, out of 9 total.
Pages in category "Ordovician"
The following 3 pages are in this category, out of 3 total. This list may not reflect recent changes (learn more).