![[trilobite in shale]](d115a.jpg) |
Trilobite in shale (Modocia typicalis) Cambrian Period, more than 520 million years
old. Courtesy of the National Museum of Natural History |
| Trilobite in Shale |
|
Trilobite in shale (Modocia typicalis) Cambrian Period, more than 520 million years
old. Courtesy of the National Museum of Natural History |
| Trilobite in Shale |
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