Radiometric dating of ordovician period Freegrannychat
By the end of the Late Ordovician the volcanic emissions had stopped.
Life continued to flourish during the Ordovician as it did in the earlier Cambrian period, although the end of the period was marked by the Ordovician–Silurian extinction event.During the Ordovician, the southern continents were collected into Gondwana.Gondwana started the period in equatorial latitudes and, as the period progressed, drifted toward the South Pole.Invertebrates, namely molluscs and arthropods, dominated the oceans, the Great Ordovician Biodiversification Event considerably increased the diversity of life.Fish, the world's first true vertebrates, continued to evolve, and those with jaws may have first appeared late in the period. About 100 times as many meteorites struck the Earth per year during the Ordovician compared with today.
As with North America and Europe, Gondwana was largely covered with shallow seas during the Ordovician.