Earth_Science_Concepts_Compatibility_Mode_

Earth_Science_Concepts_Compatibility_Mode_ - Earth Science...

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Earth Science Concepts
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Geologic Time Scale •Two ways to measure geologic time –Relative Dating –Radiometric •The Earth is considered to be 4.6 billion ears old years old
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Geologic Time Scale •Two ways to measure geologic time –Relative Dating •Tells sequence (relative age) - not exact age •Layers of rock called strata •The lower the layer, the older the rock - superposition •Strata in different regions are matched - correlation
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Geologic Time Scale •Two ways to measure geologic time –Radiometric •“exact” age determined by radioactive decay rates •Uranium-238 decays to lead-206 in 4.5 billion years •Uranium-235 decays to lead-207 in 713 million years •Radiocarbon dating uses carbon-14
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Geologic Time Periods •Time periods divided into: –Eons(largest span), eras, periods, ephochs, millions of years –Assembled before radiometric dating techniques –Ex. - Phanerozoic, Mesozoic, Jurassic, Pliocene
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• Geology is the study of dynamic processes
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This note was uploaded on 12/29/2010 for the course ENGR 514 taught by Professor Snitter during the Fall '10 term at Oregon Tech.

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Earth_Science_Concepts_Compatibility_Mode_ - Earth Science...

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