10. The Ordovician (from 485 to 443 M.y)

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During the Ordovician period, most groups of marine invertebrates existed. The first fungi appeared.

Ordovician fauna
Fossil brittle star_ Muséum de l’Ardèche
Current brittle star_Léodras_Wikipedia
Fossil Crinoid_ Muséum de l’Ardèche
Reconstitution Crinoid Preview_H_Wikipedia
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