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- Ordovician abstract "The Ordovician /ɔrdəˈvɪʃən/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago (ICS, 2004). It follows the Cambrian Period and is followed by the Silurian Period. The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian and Silurian periods respectively. Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, realized that they should be placed in a period of their own. While recognition of the distinct Ordovician Period was slow in the United Kingdom, other areas of the world accepted it quickly. It received international sanction in 1960, when it was adopted as an official period of the Paleozoic Era by the International Geological Congress.Life continued to flourish during the Ordovician as it did in the Cambrian, although the end of the period was marked by a significant mass extinction. Invertebrates, namely mollusks and arthropods, dominated the oceans. Fish, the world's first true vertebrates, continued to evolve, and those with jaws may have first appeared late in the period. Life had yet to diversify on land.".
- Ordovician thumbnail Blakey_450moll.jpg?width=300.
- Ordovician wikiPageExternalLink Fossils.
- Ordovician wikiPageExternalLink gssp.htm.
- Ordovician wikiPageExternalLink chazytxt.htm.
- Ordovician wikiPageExternalLink www.drydredgers.org.
- Ordovician wikiPageExternalLink ordovizium.htm.
- Ordovician wikiPageExternalLink gssp.htm.
- Ordovician wikiPageID "22265".
- Ordovician wikiPageRevisionID "606192761".
- Ordovician co "4200".
- Ordovician from "488".
- Ordovician hasPhotoCollection Ordovician.
- Ordovician o "13.5".
- Ordovician seaLevel "8400.0".
- Ordovician temp "16".
- Ordovician timeline "off".
- Ordovician to "443".
- Ordovician subject Category:Ordovician.
- Ordovician comment "The Ordovician /ɔrdəˈvɪʃən/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago (ICS, 2004). It follows the Cambrian Period and is followed by the Silurian Period.".
- Ordovician label "Ordovician".
- Ordovician label "Ordoviciano".
- Ordovician label "Ordoviciano".
- Ordovician label "Ordovicien".
- Ordovician label "Ordovicium".
- Ordovician label "Ordovizium".
- Ordovician label "Ordovícico".
- Ordovician label "Ordowik".
- Ordovician label "Ордовикский период".
- Ordovician label "عصر أردوفيسي".
- Ordovician label "オルドビス紀".
- Ordovician label "奥陶纪".
- Ordovician sameAs Ordovik.
- Ordovician sameAs Ordovizium.
- Ordovician sameAs Ορδοβίκια_περίοδος.
- Ordovician sameAs Ordovícico.
- Ordovician sameAs Ordoviziar.
- Ordovician sameAs Ordovicien.
- Ordovician sameAs Ordovisium.
- Ordovician sameAs Ordoviciano.
- Ordovician sameAs オルドビス紀.
- Ordovician sameAs 오르도비스기.
- Ordovician sameAs Ordovicium.
- Ordovician sameAs Ordowik.
- Ordovician sameAs Ordoviciano.
- Ordovician sameAs m.05kwh.
- Ordovician sameAs Mx4r426YVp0lQdeVUa3WgZlVvw.
- Ordovician sameAs Q62100.
- Ordovician sameAs Q62100.
- Ordovician wasDerivedFrom Ordovician?oldid=606192761.
- Ordovician depiction Blakey_450moll.jpg.
- Ordovician isPrimaryTopicOf Ordovician.