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06_rel_dating_10_pos - cture 06 c ture 06 1 06 Geologic Time 1 Relative Dating Grand Canyon Arizona Photo J Wang cture 06 c ture 06 2 Why this is

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Unformatted text preview: cture 06: c ture 06: 1 06: Geologic Time 1-- Relative Dating Grand Canyon, Arizona. Photo: J. Wang cture 06: c ture 06: 2 Why this is important • • Telling time is what sets geology apart from other physical sciences . . 530 million- year-old trilobites from the Burgess Shale, Canadian Rockies. Photo: C. Clark cture 06: c ture 06: 3 Why this is important • • Geologic dating has established that the Earth is 4.5 billion years old. Fig. 12.24 Fig. 12.24 How do we know this? It is one of the most important questions concerning the Earth. cture 06: c ture 06: 4 Relative vs. absolute dating Fig. 12.3 Fig. 12.3 Relative dating Relative dating places events in places events in their proper order their proper order Absolute Absolute (numerical) dating (numerical) dating determines how determines how many years ago an many years ago an event occurred. event occurred. cture 06: c ture 06: 5 Guiding principle James Hutton’s principle of James Hutton’s principle of uniformitarianism uniformitarianism . . “ “ The present is the key to the past.” The present is the key to the past.” Physical processes that we observe today operated in the Physical processes that we observe today operated in the same way in the geological past. same way in the geological past. Modern processes help us understand ancient events. Modern processes help us understand ancient events. Ancient mudcracks formed as mudcracks do today. Ancient mudcracks formed as mudcracks do today. QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. http://www.mysciencebox.org/ cture 06: c ture 06: 6 Guiding principle James Hutton’s principle of James Hutton’s principle of uniformitarianism uniformitarianism . . “ “ The present is the key to the past.” The present is the key to the past.” Physical processes that we observe today operated in the same way in the Physical processes that we observe today operated in the same way in the geological past. geological past. Modern processes help us understand ancient events. Modern processes help us understand ancient events. Ancient footprints formed by animals walking across sediment that later lithified. Ancient footprints formed by animals walking across sediment that later lithified. cture 06: c ture 06: 7 Guiding principle James Hutton’s principle of James Hutton’s principle of uniformitarianism uniformitarianism . . “ “ The present is the key to the past.” The present is the key to the past.” Geologic change is slow; large changes require large times. Geologic change is slow; large changes require large times. • • Soil erosion produced during rain • • Acting over geologic time, this wears down land surface www.goldengatephoto.com/ jpeg/96-12.jpg http://static.howstuffworks.com/gif/irrigation-soil- erosion.jpg cture 06: c ture 06: 8 Uniformitarianism www.coralcoe.org.au/ www.italianvisits.com/ • • Some earthquakes produce...
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This note was uploaded on 01/29/2012 for the course 460 100 taught by Professor Schlsche during the Fall '09 term at Rutgers.

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06_rel_dating_10_pos - cture 06 c ture 06 1 06 Geologic Time 1 Relative Dating Grand Canyon Arizona Photo J Wang cture 06 c ture 06 2 Why this is

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