The end-Ordovician refers to a significant geological time marker that denotes the end of the Ordovician Period, approximately 445 million years ago, characterized by one of the largest mass extinction events in Earth's history. This event led to the loss of around 85% of marine species, reshaping marine biodiversity and ecosystems dramatically. It is often associated with rapid climatic changes, including glaciation, which impacted sea levels and habitats.
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