Temperature: 17 °C
Atmospheric oxygen: 14%

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The Silurian is a relatively short geological period, lasting about 25 million years.
Laurentia collided with Baltica, closing the northern branch of the Iapetus Ocean and forming the “Old Red Sandstone” continent. Coral reefs expanded, and land plants began to colonize the barren continents.

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Animals

•Pneumodesmus
•Eurypterus
•Acanthodii
•Entelognathus

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