Hemichordates and Chordates in the Ordovician

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See Hemichordates and Chordates from the:
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Precambrian

 

Graptolites
Graptolites
© 2003 Otto S. Zapecza
Orthograptus
Orthograptus
© 2003 Thomas Kammer

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