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Lecture+13+Geologic+Time

Lecture+13+Geologic+Time - Deserts Wind erosion Deflation...

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Lecture 13 Geologic Time
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Deserts Wind erosion Deflation Lifting of loose material Produces Blowouts Desert pavement Abrasion
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Formation of a desert blowout
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Figure 6.34
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Deserts Types of wind deposits Loess Deposits of windblown silt Extensive blanket deposits Primary sources are deserts and glacial stratified drift
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Figure 6.35A
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Deserts Types of wind deposits Sand dunes Mounds and ridges of sand formed from the wind's bed load Characteristic features Slip face – the leeward slope of the dune Cross beds – sloping layers of sand in the dune
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Formation of sand dunes Figure 6.35
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Cross Beds of ancient sand dune
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Deserts Types of wind deposits Sand dunes Types of sand dunes Barchan dunes Transverse dunes Longitudinal dunes Parabolic dunes Star dunes
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Sand dune types
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Early Geologic Thinking Landscape developed by catastrophes James Ussher, mid-1600s, concluded Earth was only a few thousand years old
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