Eons

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Eon descriptives

Last updated 2:42 AM on 4/22/26
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18 Terms

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No free oxygen 

Methane, ammonia, CO2 

Hadean

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Tectonic differentiation

Hadean

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No characteristics of life

Hadean

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Increasing Oxygen

Archean

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First crust. 80% of crust formed, First evidence of tectonics

Archean

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Microbial life

Archean

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Increasing O2 to present concentrations

Proterozoic

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More new crust formed around older crust. Super continents, Snowball or icehouse earth. 

Protorezoic

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Microbial life, blue green algae. Ediacaran fauna (a test drive of more complex life on Earth. 

Proterozoic

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Paleozoic

Similar atmosphere to present

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Paleozoic

Transgressions of seawater on N. America. Three collisional events forming Appalachian Mountains. 

First land in US. Coal 

12
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Paleozoic

Marine invertebrates as dominant life form. Later add plants. 

13
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mesozoic

similar atmosphere to present

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mesozoic

Western Interior Seaway. Tethys seaway. Subduction West coast US. 

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Mesozoic

Reptiles (dinosaurs), early mammals (chipmunks) 

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Cenozoic

Similar to present, more CO2 lately in past 150 y by humankind. 

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Cenozoic

Rocky Mts.  Himalayas Mts. Alps. 

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Cenezoic

Mammals predominate