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The Hadean Eon
Transcript of The Hadean Eon
4.6-3.8 Billion Years Ago
The only rocks found during this time period are meteorities and rocks from the moon
The Archean Eon
3.8-2.5 Billion Years Ago
The earliest rocks on earth formed during this Eon
The Proterozoic Eon
2.5-Billion to 542 Million years ago
The first organisms with well developed cells appeared during this Eon
The Phanerozoic Eon
542 million years ago - Present
The rock and fossil record presents mainly the Phanerozoic Eon, which is the Eon in which we live
The Paleozoic Era (Old Life)
542-251 Million Years Ago
Marine life flourished
By the end of the Paleozoic Era amphibians,and reptiles lived on land. Insects were abundant.
The Paleozeric era ended with the largest mass extinction in history.
This extinction killed nearly 90% of all marine species
The Mesozoic Era
The Age of Reptiles
251-65.5 Million Years Ago
Reptiles dominated the Mesozoic Era
Small mammals appeared along with the dinosaurs
Birds appeared late in this Era
Possibly evolving directly from dinosaurs
At the end of the Mesozoic Era 15-20% of all species became extinct
Global climate change may have been the cause
The Cenozoic Era
Age of Mammals
65 Million Years Ago - Present
Mammals had to fight with dinosaurs and other animals for food and habitat
After the mass extinction marking the end of the last era, mammals flourished
Unique traits like regulating body temperature and mother's bearing their young may have helped the mammals survive the changes that caused the extinction of the dinosaurs
Of the presentation, not the scale