earth
http://www.futurity.org/earth-environment/life-thrived-in-early-earths-cooler-temps/
Geologic Time

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           Earth was created around 4.6 billion years ago. Since then there have been supercontinents, dinosaurs, shark eating reptiles, birds of terror, and humans. To keep track of the earth's history, the timeline was divided into Eras, Periods, and Epochs. There are three Eras, the Paleozoic, Mesozoic and Cenozoic. These are then broken into Periods, which are then divided into the Epochs. The complete breakdown of the geologic time scale is pasted below. This is the one published by the Geological Society of America in 2009.
time
 http://www.geosociety.org/science/timescale/

There are many other ways to represent the history of the earth. Some people use a spiraling timeline so you can focus on history since life began and leave ancient history in the distance. The Time scale below represents this.

timehttp://www.caveofthemounds.com/geotimeline.htm


Another method used to represent the geologic timescale is the clock diagram. This places all 4.6 billion years onto a 12 hour clock. This figure helps put the length of time that humans have walked the earth into perspective.

clockhttp://serc.carleton.edu/NAGTWorkshops/time/TLJCfindings.html