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The Ordovician ( / ɔːr d . ə ˈ v ɪ ʃ . ən / ) is a geologic period and system , the second of six periods of the Paleozoic Era . The Ordovician spans 41.2 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya. [4]