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Hadean and Archean Eons.doc

Course Code
BIO 1130
Jon Houseman
Study Guide

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Hadean and Archean Eons
Slide 1-5:
-the solar system forms by accretion or attraction of small particles being pulled in which
collapses at the centre and creates kinetic heat, forming the sun
Hadean Eon
-4 800 - 3 800 Ma
-formation of the solar system and planets
-ends with the origin of life
-creation of planets with conditions ripe for life to evolve; sets the stage for life
Archean Eon
- 3 800 Ma - 2 500 Ma
-anaerobic bacterial life; first bacterial forms
-no oxygen at first but bacteria captures energy by splitting water molecules and gives
oxygen as a by-product
-oxygen then accumulates
-oxygen causes minerals to oxidize (rust)
Proterozoic Eon
-2 500 - 543 Ma
-oxygen atmosphere
-first single celled aerobic organisms form
-more complex cells
-develop eukaryote architecture
-most single celled organisms that represent the prokaryotes and eukaryotes
Phanerozoic Eon
- 543 Ma -present
-in a very short period of time, multicellular life appears
-can be divided into the paleozoic eon (543-251 Ma), mesozoic eon (251-65 Ma), and
Cenozoic eon (65 Ma to present)
meso = middle
paleozoic- all organisms are in the oceans; eon ends when organisms move up on
mesozoic- plants go through major change (i.e.: flowers); they are fertilized with
pollen instead of spores
-dinosaurs become successful
cenozoic- cataclysmic event causes dinosaurs disappear; mammals / birds thrive
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