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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.

The land portion of the Canning Basin covers approximately 430,000 km2.

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.

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.

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There are 234 legislative districts in the country, each composed of about 250,000 people.