06_rel_dating_09_post

06_rel_dating_09_post - 06: Relative Dating...

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ture 06: ture 06: 1 06: Relative Dating Grand Canyon, Arizona.  Photo: J. Wang
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ture 06: 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
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ture 06: ture 06: 3 Why this is important    Geologic dating has established that  the Earth is 4.5 billion years old. Fig. 12.24 How do we know this?  It is one of the  most important questions concerning  the Earth.
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ture 06: ture 06: 4 Relative vs. absolute dating Fig. 12.3 Relative dating  Relative dating  places  places  events in their proper events in their proper  order order Absolute (numerical)  Absolute (numerical)  dating dating  determines   determines  how many years ago  how many years ago  an event occurred. an event occurred.
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ture 06: 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 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 mudcracks formed as mudcracks do today. Ancient mudcracks formed as mudcracks do today.
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ture 06: 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. 6 Ancient footprints formed by animals walking across sediment that later Ancient footprints formed by animals walking across sediment that later lithified. lithified.
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ture 06: ture 06: 7 Guiding principle James Hutton’s principle of uniformitarianism. James Hutton’s principle of 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
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This note was uploaded on 09/25/2011 for the course GEOLOGY 100 taught by Professor Lepre during the Fall '11 term at Rutgers.

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06_rel_dating_09_post - 06: Relative Dating...

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