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Eocene
fossil record
4
skull
Acosmanura
2
Amphibia
2
Animal Structures
2
Animals
2
Antarctic Regions
2
Antarctica
2
Archosauria
2
Article
2
Aves
2
Biological Evolution
2
Birds
2
Cretaceous
2
Dinosauria
2
Dinosaurs
2
Extinction, Biological
2
Fossils
2
Green River
2
Green River Formation
2
Holocene
2
Mesozoic
2
North America
2
Passeriformes
2
Pelodytidae
2
Pelodytomorpha
2
Pleistocene
2
Skull
2
United States
2
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1
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2
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3JOUR
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4