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Geology, Stratigraphic --- Geology --- From 500 to 570 million years ago
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Geology, Stratigraphic --- From 230 to 570 million years ago
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Paleontology --- Trilobites --- From 500 to 570 million years ago --- Alaska.
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"Description and illustration of an unusual fossil having laminated inner deposits containing heavy minerals."
Paleontology --- From 500 to 570 million years ago --- Nevada
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Ostracoda, Fossil. --- Paleontology --- From 230 to 570 million years ago
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Ostracoda, Fossil. --- Paleontology --- From 230 to 570 million years ago
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Geology --- Geology, Stratigraphic --- From 230 to 570 million years ago
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Geology, Stratigraphic --- Geology --- From 230 to 570 million years ago
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Paleontology --- Trilobites --- From 500 to 570 million years ago --- Nevada.
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