GEOLOGIC TIME ESRT PAGES 8 and 9. AGE OF EARTH 4.6 Billion Years old = 4600 Million Years old MYA =...
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Transcript of GEOLOGIC TIME ESRT PAGES 8 and 9. AGE OF EARTH 4.6 Billion Years old = 4600 Million Years old MYA =...
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GEOLOGIC TIME
ESRT PAGES 8 and 9
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AGE OF EARTH
• 4.6 Billion Years old = 4600 Million Years old
• MYA = millions of years ago
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GEOLOGIC TIME
• Based on fossil evidence and mass extinctions
• Life forms have evolved over time
• 4 MAJOR ERAS
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1. PRECAMBRIAN
• Longest era 4.6 billion years to 544 million years ago,
longest geologic era, lasted about 4 billion years • No fossil record – WHY?
a. Most rocks were non-sedimentary because the earth was still cooling
b. Small organisms with no hard shells
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Ending of Precambrian Era sees a sudden explosion of life due to evolution of atmosphere
What process added oxygen to the atmosphere?
photosynthesis
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2. PALEOZOIC
• 544 million years to 251 million years ago
• Invertebrates
• Fish, amphibians, vertebrates
• land plants first appear
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At the end of Paleozoic
• massive climate change and mega volcanoes that erupted for centuries
• Massive release of CO2 into atmosphere
• Temps on planet warmed
• Mass extinction of trilobites, eurypterids, fern-like plants and many insects
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3. MESOZOIC
• 251 million years to 65 million years ago
• Dinosaurs
• Earliest Birds and mammal
• Extinction of dinosaurs
• 63 Millions years ago
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At end of Mesozoic
• Asteroid impact
• Vast cloud of searing vapor and debris raced over continents incinerating everything in its path
• Pulverized rock was ejected
• Enough heat was generated to broil surface of planet
• Lots of sulfur in the air
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• All dinosaurs became extinct as well as many, many other organisms
• Evidence of impact crater is in the Yucatan peninsula in Mexico
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4. CENOZOIC
• 65 million years ago to present
• Modern plants and animals
• Last 2 million years - age of man,
dominated by glaciation
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