The Ordovician was in the Paleozoic era, and lasted from 505 to 438 million years ago. Trilobites were common then, and the earliest jawless, bony fish.

No mammals existed in the Ordovician

Algae was the dominant plant of the Ordovician. There were little to no other plants (other then algae) during the Ordovician. In the Ordovician, the common types of algae were Stromatolites (Blue green algae), and Tetradium (Red algae).

The Ordovician lasted for 47 million years from 490 to 443 Million Years Ago.

The Ordovician lasted for 47 million years from 490 to 443 Million Years Ago.