1Hadean Eon (Earth’s Formation)2Archean Eon (Life Beginning and Photosynthesis)Robert Rich3Proterozoic Eon (Oxygen Crisis and First Snowball Earth)Robert RichDavid Helpling4Paleozoic Era (Transformation - Animals and Plants Emanate onto Land)Robert Rich5Mesozoic Era (First Mammals and Birds)Robert RichDavid Helpling6Cenozoic Era (Climate changes; Homo Habilis and Evolution)Robert Rich7Anthropocene (Humans Impact Earth’s Geology and Ecosystems)Robert Rich8Precambrian (Earth's Geologic Time Scale Impact)Robert RichListen to full