The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago.
The Ordovician is best known for its diverse marine life.
This shows the different temperatures during this time period.
Fish started to become more popular and spreading more in the fossil record
During the Ordovician, most of the world's land — southern Europe, Africa, South America, Antarctica, and Australia — was collected together in the super-continent Gondwana.
Increased sea floor spreading happened with volcanic activity occurred in the early Middle Ordovician.
divided into three epochs: Early Ordovician (485.4 million to 470 million years ago), Middle Ordovician (470 million to 458.4 million years ago), and Late Ordovician (458.4 million to 443.8 million years ago).
During this period the first plants appeared on land.
The greatest extinctions occurred in the tropical oceans, and over a hundred families went extinct.
The world looked very different during the Ordovician Period
The major global patterns of life went through huge change during the Ordovician.
Ordovician radiation changed the appearance of every group of organisms
What ended the Ordovician period was the freezing weather which lead to the second largest extinction
60% of all marine invertebrates and 25% of all families went extinct.
During the Upper Ordovician, a major glaciation happened in Africa ended in a major drop in sea level which drained nearly all craton platforms.