Clocks in Rocks I

Clocks in Rocks I - Clocks in Rocks I (Geological time)...

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Clocks in Rocks I (Geological time) Geological time - The earth and the solar system are ca 4.5 Gy old - This is about 1/3 the age of the universe - During this time the solar system has rotated 15 times around the Milky way galaxy - Travelling 1.7 million light years in the process - 1 mm/year= 1km/million years - History of earthquakes along Dead Sea transform fault o Some separated by 500 years, 1 per 100 years o On geological time scale 10,000 earthquakes per 1 million years - Rate of Sedimentation o Sedimentary rocks accumulate at average rates less that 1mm year Relative dating suing the stratigraphic record - Stratigraphy - geometric and age relationship of rock bodies - Stratigraphic sequence - Use of fossils for correlation - Unconformities - Cross-cutting relationships Law of Superposition - Sedimentary sequences were originally deposited as approximately horizontal beds - Younger sediments lie above older - Cambrian to Paleogene eras are represented by rocks in the Grand Canyon, Zion
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This note was uploaded on 10/05/2008 for the course GEOL 105Lg taught by Professor Davis,platt during the Fall '07 term at USC.

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Clocks in Rocks I - Clocks in Rocks I (Geological time)...

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