Snowball Earth

(Million Years Ago. Wouldn't support the date format)
This is a time period when the earth would have looked like a giant snowball, hence the name. It is unknown as to what the water source looked like. There are two main theories, where the equator was like a water belt, or there were various "pockets," where hot springs melted the surface of the ice encasing it.

(MYA) Start of a series of glaciations during the global freeze.

(MYA) Longest and first of the glaciations during the Cryogenian period.

(MYA) Volcanic activity was able to increase the amount of carbon dioxide in the atmosphere and aided in the warming up of Earth to bring it out of the frozen state.

(MYA) Interglacial period, thought to be caused by volcanic activity

(MYA) Second of the glaciations to occur during the Cryogenian period.

(MYA) Algae populations rise

(MYA) This was a period of time when Snowball Earth was melting down and warming up based of a few theories. These theories include the increase of CO2 from volcanic eruption and sponge-like animals.

(MYA) The oldest definitive fossils of complex animals

(MYA) This was the ending of a deep freeze era and the beginning of an explosion of life thought to have been initiated by Snowball Earth