What did Earth look like in the Devonian? (419–359 Ma)

The 'Age of Fishes'. Fish diversified explosively, the first tetrapods and forests emerged, and a major extinction struck in the Late Devonian.

Key events of this period

First Insects
410 Ma
First wingless insects appeared. Later evolved wings in the Carboniferous, becoming the most successful animal group in Earth's history.
Late Devonian Extinction
375 Ma
A prolonged extinction eliminating ~75% of marine species. Reef ecosystems and trilobites were hit hardest. The cause remains debated.
First Tetrapods
375 Ma
First four-limbed vertebrates evolved from fish like Tiktaalik. The great transition from water to land began.