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Cataclysmic events
Crater Lake, Oregon partly fills a 4,000 feet (1,220 m) deep caldera that was formed in 5,677 (± 150) BC by the collapse of a volcano.
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Featured Article
The Late Paleozoic: Responding to Catastrophe
Every major catastrophe seems to provide opportunities for new biological life forms. So it was with the Ordovician–Silurian Extinction. Up to that point, life had been... More »
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Featured Article
The Early Paleozoic: Major Expansions and...
By 0.57 Ga, Earth’s climate became warm, and the glaciers retreated. The continents were primarily low-lying deserts and alluvial plains. Rising sea levels encroached... More »
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Featured Article
The Age of the Dinosaurs
Reptiles occupied the void left by the Great Dying and dominated animal life from 251 megayears (Ma) to 66 Ma (one megayear = one million years ago), an era known as the... More »
The Late Paleozoic: Responding to Catastrophe
Last Updated on 2012-08-22 at 14:54
Every major catastrophe seems to provide opportunities for new biological life forms. So it was with the Ordovician–Silurian Extinction. Up to that point, life had been... More »
The Age of the Dinosaurs
Last Updated on 2012-08-22 at 14:54
Reptiles occupied the void left by the Great Dying and dominated animal life from 251 megayears (Ma) to 66 Ma (one megayear = one million years ago), an era known as the... More »
The Early Paleozoic: Major Expansions and Extinctions
Last Updated on 2012-05-07 at 18:58
By 0.57 Ga, Earth’s climate became warm, and the glaciers retreated. The continents were primarily low-lying deserts and alluvial plains. Rising sea levels encroached... More »
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