![[Trilobite]](d117a.jpg) |
Trilobite, Isotelus latus, Ordovician period, about 450 million years old. Courtesy of the National Museum of Natural History |
| Trilobite |
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Trilobite, Isotelus latus, Ordovician period, about 450 million years old. Courtesy of the National Museum of Natural History |
| Trilobite |
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