PRECAMBRIAN ERA BEGINS



4.6 gA Formation of the solar system (including Earth)

PRECAMBRIAN TIME (ERA) BEGINS – HADEAN EON BEGINS

3.9 gA ARCHEOZOIC (ARCHEAN) EON BEGINS

Atmosphere similar to Miller-Urey Experiment

3.5 gA Earliest evidence of life: Bacteria in oceans

3.0 gA Earliest Photosynthetic bacteria in oceans

2.5 gA PROTEROZOIC EON BEGINS

2.1 gA Earliest macroscopic organisms -

1.5 gA Earliest cells with a nucleus (Eukaryotes)

630 mA Earliest Multicellular animals (in oceans)

540 mA PRECAMBRIAN TIME ENDS/ PALEOZOIC ERA BEGIN

“Cambrian Explosion” of life - many new forms of life in oceans;

most present phyla develop/originate

“Age of Invertebrates”

500 mA First fish (jawless fish appear)

440 mA First Mass Extinction of Life

400 mA First Fish with Jaws/ Ozone Layer forms in atmosphere

380 mA First Insects

350 mA First Amphibians

300 mA First Reptiles

240 mA Second Mass Extinction: 96% loss of species

225 mA PALEOZOIC ERA ENDS/ MESOZOIC ERA BEGINS

220 mA First Dinosaurs

200 mA First Mammals/ Pangaea breaking up

150 mA First Birds

140 mA First Flowering Plants

100 mA Rocky Mountains forming

65 mA Last Mass Extinction: Dinosaurs

65 mA MESOZOIC ERA ENDS/ CENOZOIC ERA BEGINS

40 mA Earliest Primates

5 mA Earliest “man-like” mammals

3 mA N. & S. America joined by Central America

2 mA Early Man in Africa & other parts of the World

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