Lecture 19 - Geologic Time

Lecture 19 - Geologic Time - Lecture 19 Geologic History...

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Lecture 19 Geologic History
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Geologic Time Scale Divides geologic history into units Originally developed using relative dates
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Geologic Time Put in Perspective Earth’s crust forms Cambrian explosion 1 st dinosaur 1 st Humans oldest rocks one-celled organisms dinosaurs extinct GT beats UGA 2010
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Precambrian Era 4.5 billion to 540 million years ago 88% of Earth's history Only sketchy knowledge Most Precambrian rocks are devoid of fossils
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Geologic Time Scale Subdivisions Eon Greatest expanse of time Four eons Phanerozoic ("visible life") – the most recent eon Proterozoic Archean Hadean – the oldest eon
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Geologic Time Scale Subdivisions Era - Subdivision of an eon Eras of the Phanerozoic eon Cenozoic ("recent life") Mesozoic ("middle life") Paleozoic ("ancient life") Eras are subdivided into periods Periods are subdivided into epochs
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The Geologic Time Scale
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Figure 12.5H-M
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Formation of the Moon
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The Solar System
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Figure 12.7
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