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Paleozoic Era
The Paleozoic Era began around the time of the Cambrian Explosion 541 million years ago. It is the first time the world saw widespread multi-cellular life.
Elrathia kingi
Middle Cambrian Wheeler Formation, Utah
This Phacopid trilobite from the Devonian period exhibits exceptional preservation. This specimen is preserved so well, its eye structure can be seen very clearly.
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