BBCearth has a cool page called The 25 Biggest Turning Points in Earth’s History.   The list includes events like the formation of the Earth, the great oxidation event, the “Cambrian Explosion”, and various mass extinction events like the “Great Dying” and extinction of the non-avian dinosaurs.   It’s well done and includes estimates on when the events happened.

There’s a bunch of good content over at BBCearth.