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Huntonia sp. Harrigan Formation, Clarita, Oklahoma Phacops ferdinandi Bundenbach, Germany Unidentified Trilobite Hunan Province, China
Permian, about 375 million years old.
Matrix is about 60 mm (2.5 inches) across.
Devonian, about 400 million years old.
Matrix is about 100 mm (4 inches) across.
Ordovician, about 455 million years old.
Specimen is about 185 mm (3.5 inches) long.
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