9 Geologic Time

9 Geologic Time - GeologicTime HowoldistheEarth?...

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Geologic Time
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How old is the Earth? Catastrophism  Earth created in a series large events  Rare periods of upheaval
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How old is the Earth? Uniformitarianism  Processing operating today have operated in the  past
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Siccar Point, Scotland Siccar Point, Scotland Processes act slowly               Earth must be old! Processes act slowly               Earth must be old! How old is the Earth? Uniformitarianism
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Relative vs. Absolute Relative Time  Sequence of events Absolute Time  Assigning a numerical age
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Relative Geologic Age Guided by principles… Principle of Superposition  Older at bottom  Younger at top Older Younger
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Principle of Original Horizontality  Sediment layers deposited flat Relative Geologic Age
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Principle of Lateral Continuity  Layers will pinch out Relative Geologic Age
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Relative Geologic Age Principle of Cross-Cutting  Any rock cutting through  another rock is always  younger Principle of Inclusions  Any rock included in  another is always older
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Relative Geologic Age
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Relative Geologic Age Unconformities  – missing time  Nondeposition or Erosion
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This note was uploaded on 04/19/2011 for the course EES 2001 taught by Professor Thornburg during the Spring '11 term at Temple.

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9 Geologic Time - GeologicTime HowoldistheEarth?...

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