History of Life - Chapter 4

Jul 20th, 2016
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These are my personal notes from the textbook "History of Life". This is Chapter 4

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Chapter 4Proterozoic microbes1. Proterozoic ocean was anoic, rich in dissolved iron, silica, and sulfide2. Acritarchs - spherical microfossils with thick and complex organic wallsSnowball or slush ball Earth1. Cryogenian - when Earth went through a series of dramatic cold periods2. Snowball Earth model - ocean surface was frozen all the way to the equatora. Volcanoes continue to release CO2 into the atmosphereb. Carbon dioxide melted the ice and caused a greenhouse hot period 3 timesc. Calls for a catastrophe to trigger a metazoan revolutiond. The term snowball Earth could be too ext

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