ARCHEAN PERIOD
Archean began 2.5 billion years ago and ended 542.0 million years ago. The atmosphere was mainly carbon dioxide with very little oxygen in it. Around the beginning of the Archaean Eon, the earliest living cells formed on Earth. Once a lot of cells were photosynthesizing there started to be more and more oxygen on Earth. But during the Archaean Eon almost none of that oxygen was in the atmosphere.
PERMIAN PERIOD
Gymnosperms were the dominant plant. During the Permian, there were many animals, including Edaphosaurus, Dimetrodon, and other pelycosaurs; Eryops, Diplocaulus, archosaurs, amphibians, fish, and lots of invertebrates.
CAMBRIAN PERIOD
There were metazoan phylum, sponge spicules, probable worm tubes, coralline red algae, and dasyclad green algae all flourished during this time period
Credits:
Created with images by Kiran Kumar G - "Life" • James St. John - "Twin Lakes area along the Beartooth Highway (Beartooth Mountains, northwestern Wyoming, USA)" • Trailmix.Net - "Trilobite" • Grand Canyon NPS - "Grand Canyon National Park- Toroweap Formation_0936" • Grand Canyon NPS - "Grand Canyon: Tapeats sandstone 0113b"