Precambrian

Hadean Eon (Earth’s Formation)

Archean Eon (Life Beginning and Photosynthesis)

Proterozoic Eon (Oxygen Crisis and First Snowball Earth)

Paleozoic Era (Transformation - Animals and Plants Emanate onto Land)

Mesozoic Era (First Mammals and Birds)

Cenozoic Era (Climate changes; Homo Habilis and Evolution)

Anthropocene (Humans Impact Earth’s Geology and Ecosystems)

Precambrian (Earth's Geologic Time Scale Impact)