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Ordovician period dating

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During the Orodovician period, most of the land on earth was in the form of one super continent, Gondwana, which consisted of what is now Southern Europe, Africa, South America, Antarctica, and Australia.

Climate The beginning of the Ordovician period had a climate that was extremely hot.

) 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.

Two major strata found in the northern Canning Basin are the Emanuel and Gap Creek Formations.

The Emanuel formation, which lies directly below the Gap Creek formation, consists of the earliest dated sediments in the Canning Basin.

) is a geologic period and system, the second of six periods of the Paleozoic Era.

It ended with the Ordovician–Silurian extinction event, about 443.4 ± 1.5 Mya (ICS, 2004) that wiped out 60% of marine genera.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.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.Around seventy percent of the shells recovered from the basin are broken which suggests the occurrence of strong tides.