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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