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ORDOVICIAN PERIOD
505-438 Million Years Ago

During the early Ordovician period the first vertebrate fish have been found.  Graptolites and corals also flourished.

Ordovician sea

Ordovician period 
Precambrian period
Cambrian period
Ordovician period
Silurian period
Devonian period
Carboniferous period
Permian period, Dimetrodon
Triassic dinosaur
Jurassic dinosaur pictures
Cretaceous dinosaur pictures
Tertiary prehistoric animals
Quaternary prehistoric animals

 
       

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