S2009_GeologicTime(2)

S2009_GeologicTime(2) - GEOSC 021 Earth and Life Spring...

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GEOSC 021 Earth and Life Spring 2009 Relative and Absolute Timescales Individual Assignment Name: #1 #2 #3 #4 #5 #6 #7 (a) (b) (c) #1-3 are depositional layers #4 is an igneous intrusion #5 is a fault (which does not break the surface) #6-7 are erosion boundaries 1. What is the correct order of the events depicted in the figure above, from oldest to youngest? (use #1-7, ignore the letters for now) (7 pts) 2. Explain the principle of original horizontality. Assuming that the principle holds, explain how Unit 1 may have been tilted. (4 pts)
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Radioactive elements decay at a fixed rate, regardless of temperatures, pressures, or other geologic forces. The time it takes for half of the radioactive parent material to decay to a stable element is called the half-life. In one half-life, half of the original material will remain, in two half-lives, a quarter of the original material will remain, etc. Radiological dating depends on having an accurate count of both the parent and daughter atoms. Parent Isotope
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This note was uploaded on 09/09/2009 for the course GEOSC 021 taught by Professor Zellpaul during the Spring '08 term at Penn State.

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S2009_GeologicTime(2) - GEOSC 021 Earth and Life Spring...

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