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WEBAug 9, 2024 · Ordovician Period, in geologic time, the second period of the Paleozoic Era. It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years ago, when the Silurian Period …
The Ordovician Period - University of California …
WEBThe Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates). A typical marine community consisted of these animals, …
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Ordovician Period | Natural History Museum
WEBAug 10, 2012 · The Ordovician ended with the second greatest extinction event of the Phanerozoic Eon. Two massive reductions, a million years apart, created this event—resulting in the extinction of more than 60% of …
Ordovician - New World Encyclopedia
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A short history of the Ordovician System: from overlapping unit ...
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