Geologic Timeline

The Paleozoic Era marked the first fossil records of animal life.The Cambrian explosion was the largest diversification of life in Earth’s history.

4,567,000,000 years ago, Earth was covered in molten lava. In the Hadean Eon, it was in its earliest stage of formation as it clumped from a cloud of dust.

The Cenozoic Era started with the extinction of dinosaurs and moved into the age of mammals.This led to the diversification and increase in size of mammals.

Earth formed a stable climate in the Archean Eon. Because it cooled down from its molten state, Earth was able to support oceans, continents and oxygenation

In the Proterozoic Eon, key highlights are: ozone layer thickened, an oxygen crisis, Snowball Earth and eukaryotes and multicellular organisms evolved.

The Mesozoic Era had a lot of “firsts”. For example, it had the first birds, first mammals, first dinosaurs and first flowering plants on Earth.