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Early Ordovician first appearances
Paleozoic life of Nova Scotia
Paleozoic life of Ontario
Paleozoic life of Quebec
Paleozoic life of Yukon
Prehistoric animal genera
Late Devonian genus extinctions
Late Devonian animals
Paleozoic life of the Northwest Territories
Paleozoic life of Alberta
Devonian animals
Silurian animals of North America
Tentaculita

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Tentaculites

Pterygotus

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Ordovician

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