GEOL 1020 Lecture 12: Abundant Life in Proterozoic Eon
27 Oct 2016
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What we have covered so far in lecture (time scale): Proterozoic eon: 2. 50 - 0. 542 billion years ago. Proterozoic eon: 2. 5 billion to 542 million years ago. Cyanobacteria is pound scum which rose in this eon. First to use sunlight and water to grow and maintain life. The polluted to earth with o2, which caused the first eukaryotes (organisms with cells like ours) Many of the most exciting events in the history of the earth and of life occurred during the. Proterozoic -- stable continents first appeared and began to accrete, a long process taking about a billion years. Also, coming from this time are the first abundant fossils of living organisms, mostly. Bacteria and archea, but by about 2. 1 billion years ago eukarya cells appear as fossils too. With the beginning of the middle proterozoic comes the first evidence of oxygen build-up in the atmosphere.
