Category:Early Ordovician first appearances
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Biological taxa that first appeared during the Early Ordovician epoch of geologic time, between 485.4 and 470 million years ago.
Subcategories
This category has the following 2 subcategories, out of 2 total.
Pages in category "Early Ordovician first appearances"
The following 53 pages are in this category, out of 53 total. This list may not reflect recent changes.