The Keller Natural History Museum
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Precambrian Time
Precambrian Time Life Forms
First Mass Extinction
Paleozoic Era
Paleozoic Era Life Forms
Paleozoic Mass Extinction
Mesozoic Era
Mesozoic Era Life Forms
Mesozoic Mass Extinction
Cenozoic Era
Cenozoic Era Life Forms
The First Mass Extinction
The First Mass Extinction was 544 million years ago. The final stage of Precambrian Time was a global (whole world) ice age. It led to a widespread extinction all over the world. This was the last event in Precambrian Time.