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89% of Earth’s Geologic Time

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Presentation on theme: "89% of Earth’s Geologic Time"— Presentation transcript:

1 89% of Earth’s Geologic Time
PRECAMBRIAN 89% of Earth’s Geologic Time

2 Giant Impact Hypothesis 4.5-4.7 BYA

3 Hadean Eon: 4.000-4.567 BYA Time of the heavy bombardment
Following formation of the earth-moon system

4 Archean Eon 4.000 – 2.500 BYA First appearance of life (~3.7 BYA)
Appearance of continental plates (formation of granite) Stable atmosphere Oxygenic photosynthesis (3.5 BYA) Pillow Lava in the Temagami Greenstone Belt of the Canadian Shield

5 Proterozoic Eon – BYA Characterized by rise in microbial life Photosynthesis gave rise to increased levels of oxygen (Great Oxygenation Event) ~ BYA Photosynthesis caused drawdown of atmospheric carbon Led to multiple Ice Ages (the first one was in the Archaean) Huronian Glaciation 2.4 – 2.1 BYA Cryogenian Glaciations – BYA Eukaryotes appeared around 2 BYA Followed by the Boring Billion ( BYA) Multicellular organisms appeared around BYA (Ediacaran Fauna) Stromatolite from South America

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