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Rhaetian extinctions
Fossils of Brazil
Carboniferous cartilaginous fish
Permian cartilaginous fish
Prehistoric cartilaginous fish genera
Xenacanthiformes
Permian Brazil
Prehistoric fish of North America
Fossil taxa described in 1848
Prehistoric fish of Asia
Prehistoric fish of South America

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Xenacanthus

Postosuchus

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Hamilton Quarry

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Dimetrodon

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Frilled shark

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