Ch 25 Important dates

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23 Terms

1
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200,000 ya

modern humans

2
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6-7 mya

hominin lineage

3
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65.5 mya

Cenozoic Era: Cretaceous Mass Extinction: modern continents

4
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140 mya

Angiosperms

5
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252 mya

Mesozoic Era: Permian Mass Extinction: Pangea

6
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300 mya

Gymnosperms

7
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365 mya

tetrapods evolve

8
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400 mya

vascular plants

9
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450 mya

Arthropods colonize land

10
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500 mya

fungi, plants and animals colonize land

11
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530 mya

Cambrian Explosion

12
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541 mya

Paleozoic Era begins

13
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600 mya

Edicaran Biota

14
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700 mya

1st animals

15
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1.2 bya

multicellular Eukaryotes

16
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1.8 bya

1st Eukaryotes

17
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2.4 bya

Oxygen Revolution

18
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2.5 bya

Proterozoic Eon begins

19
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2.7 bya

“gassing out”

20
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3.5 bya

1st Prokaryotes

21
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4 bya

Archaean Eon: Seas form

22
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4.6 bya

Hadean Eon: Earth formed

23
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what is “gassing out”?

prokaryotes photosynthesized oxygen into the atmosphere reacted with iron, the iron dissolved and “gasses out” into the atmosphere