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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Origin of the atmosphere Origin of the atmosphere and oceans and oceans Water vapor condensed to form clouds and rainwater that formed the oceans About 3.5 billion years ago, photosynthesizing bacteria began to release oxygen Oxygen levels steadily increased over time Eventually oxygen levels were sufficient for ozone to develop in the atmosphere
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Origin of the atmosphere Origin of the atmosphere and oceans and oceans Outgassing produced acidic conditions that caused an accelerated rate of weathering of Earth’s rocky surface Products of this weathering were carried to the oceans, thus increasing the salinity of the oceans Oceans also served as a depository for carbon dioxide
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This note was uploaded on 01/26/2012 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Tech.

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

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