Word: ordovician
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Proterozoic ? First shellfish and corals Cambrian Ordovician ? First fsh Silurian ? First land plants Devonian ? Tiktaalik ? First tetrapods Carboniferous ? First reptiles ? First mammal-like reptiles Permian Triassic ? First dinosaurs ? First mammals Jurassic ? First birds Cretaceous ? First flowering plants Cenozoic ? First horses...
...Having reached their heights in the Ordovician, the Trilobites began to waste their substance in riotous living. Before the close of the Permian, the last Trilobite had been banished from the face of the earth. The Trilobites probably arose from segmented worms in the Pre-Cambrian...
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