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11 Cards in this Set
- Front
- Back
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Haden Eon |
Earth is hell; CO2 in the atmosphere; little to no oxygen No life |
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Archean Eon |
Water forms; 80% of the continental crust forms; co2 dissolves into ocean and nitrogen becomes dominant Prokaryotes (fossilized bacteria and Archaea) Still no oxygen in the atmosphere |
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Proterozoic Eon |
Beginning: Small, fast moving plates; small continents End: Great oxygenation event; large moving plates, large continents, 02 rich atmosphere |
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BIFS |
2.7 ga - photosynthetic organisms present; 02 released by autotrphos reacted with other elements to get iron oxide |
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Red Beds |
Pyrite reacts Rusted ocean, rusted the land, oxygen goes into the atmosphere Creates red beds of hematite |
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What marked the end of the protoerozoic eon? |
Radical climate shifts may have led to very cold conditions Escape via volcanoes Eukaryotic life proliferates |
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What are the three eras in the phanerozoic? |
Paleozoic, Mesozoic, Cenozoic |
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Paleozoic (Prehistoric life) Era |
Sea level rose and fell; diversification of life; Pangea formed; mountain formation events; terrestrial organisms eventually flourish; Enormous insects |
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Mesozoic Era |
Dinosaurs; Pangea breaks apart; Climate is greenhouse conditions; fast sea floor spreading rate; marked with KT boundary event |
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K-T Boundary Event |
World wide clay later show show glass sphere from molten rock, shocked quartz from pressure, iridium - started cooling period. |
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Cenozoic ERa |
Lots of mammals, glacier expand and retreat, climate cooled |
