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1 CE
4500 Million years ago (Formation of Earth
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2
3900 Million Years ago (Oldest known bedrock
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3
3700 Million Years ago (1st rock of organic origin
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4
3700-1800 Million Years ago (Precambrian Iron Deposits
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5
3000 Million years ago (Photosynthesis of plants begins
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6
2100 Million Years ago (Oxegen dominates weathering
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7
1800 Million Years ago ( Limestone forms
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8
570 Million Years ago ( Fossils become abundant
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9
420 Million years ago ( Earliest plants and animals on land