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The Ordovician period It is the period that follows the Cambrian period within the Paleozoic era that spans from 485 million years ago to 440 million years ago.
The Ordovician was a time when history of the earth in which many species that we still find today evolved, such as some primitive fish, cephalopods and corals.
However, the most common life forms were trilobites, snails, and shellfish; and as a remarkable fact is the colonization of the land by the first arthropods, who crawled to occupy Gondwana, which until now was a continent devoid of animal life.
The Ordovician-Silurian Extinction
Towards the end of the period, the Ordovician-Silurian extinction, occurred when the Iapetus Ocean was closed when Gondwana moved from the equator to the South Pole and Laurentia collides with Baltic, causing a great drop in sea level and killing life on the coast.
This caused a huge glaciation, leaving the Earth as a great "snowball", where 60% of marine invertebrates became extinct.
It may interest you:
The Cambrian period
The Silurian period
The Devonian period
The Carboniferous period
The Permian period
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