Lecture+13+Geologic+Time - Lecture 13 Geologic Time Deserts...

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Unformatted text preview: Lecture 13 Geologic Time Deserts Wind erosion Deflation Lifting of loose material Produces Blowouts Desert pavement Abrasion Formation of a desert blowout Figure 6.34 Deserts Types of wind deposits Loess Deposits of windblown silt Extensive blanket deposits Primary sources are deserts and glacial stratified drift Figure 6.35A 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 Formation of sand dunes Figure 6.35 Cross Beds of ancient sand dune Deserts Types of wind deposits Sand dunes Types of sand dunes Barchan dunes Transverse dunes Longitudinal dunes Parabolic dunes Star dunes Sand dune types Early Geologic Thinking Landscape developed by catastrophes James Ussher, mid-1600s, concluded Earth was only a few thousand years old Modern geology James Hutton Theory of the Earth Published in the late 1700s Uniformitarianism Fundamental principle of geology "The present is the key to the past" Relative dating Placing rocks and events in sequence Principles and rules of Law of superposition oldest rocks are on the bottom Principle of original horizontality sediment is deposited horizontally Principle of cross-cutting relationships younger feature cuts through an older feature Relative dating...
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This note was uploaded on 10/22/2008 for the course EAS 2600 taught by Professor Ingalls during the Fall '08 term at Georgia Institute of Technology.

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Lecture+13+Geologic+Time - Lecture 13 Geologic Time Deserts...

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