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Ordovician period




Ordovician marine scene
A period of the Paleozoic era that spans the time between the Cambrian and the Silurian, about 490 to 443 million years ago. The Ordovician period is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).


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   • GEOLOGY AND PLANETARY SCIENCE