Lecture16 - Quote of Day “ Try not to become a man of...

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Unformatted text preview: Quote of Day “ Try not to become a man of success but a man of value. ” ( Albert Einstein ) http://www.inspirational-quotes.info/inspirational-quotes-1.html Geologic Time Question: Which elephant is oldest? Youngest? Question: Which elephant is oldest? Youngest? oldest youngest Question: How old is the oldest elephant? Youngest? These two questions are related to relative time versus absolute ages . • Relative time : Which elephant is oldest? Youngest? • Absolute age : How old is the oldest elephant? Youngest? oldest youngest Born in 1970 Born in 1999 Relative time Absolute Age The same two questions are frequently asked in the geosciences. • Relative time: Which rock unit is oldest? Youngest? • Absolute age: How old is the oldest rock unit? Youngest? Relative time Absolute Age http://ruby.colorado.edu/~smyth/images/dike.jpg older younger 975 Ma 375 Ma (I made up these ages.) Relative dating Geologists use a number of principles to decipher the relative time of events. ¾ Law of superposition ¾ Principle of original horizontality ¾ Principle of inclusion ¾ Principle of cross-cutting relations ¾ Principle of fossil succession Law of superposition - oldest rocks are on the bottom in an undeformed sequence of sedimentary rocks. The sand on this beach was deposited on top of other sediments (or rocks), and could be overlain by more sediments in the future. igure 9.2 Sedimentary rocks exposed on a wall of the Grand Canyon Relative dating Geologists use a number of principles to decipher the relative time of events. ¾ Law of superposition ¾ Principle of original horizontality ¾ Principle of inclusion ¾ Principle of cross-cutting relations ¾ Principle of fossil succession Original Horizontality - Layers of sediment are generally deposited in a horizontal position....
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This note was uploaded on 04/18/2011 for the course EAS 101 taught by Professor Kirschner during the Spring '11 term at Saint Louis.

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Lecture16 - Quote of Day “ Try not to become a man of...

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