Ch08_Outline - Chapter8 GeologicTime HistoricalNotes Catastrophism JamesUssher,mid1600s,concluded old Moderngeology Uniformitarianism " Histor

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 Chapter 8  Geologic Time
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    Historical Notes  Catastrophism Landscape developed by catastrophes  James Ussher, mid-1600s, concluded  Earth was only a few thousand years  old  Modern geology   Uniformitarianism  Fundamental principle of geology  "The present is the key to the past" 
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    Historical Notes  Modern geology   James Hutton  Theory of the Earth   Published in the late 1700s 
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    Relative Dating Law of superposition Developed by Nicolaus Steno in 1669 In an undeformed sequence of  sedimentary rocks (or layered  igneous rocks), the oldest rocks are  on the bottom
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    Superposition Is Well Illustrated by the Strata in the Grand Canyon Figure 8.2
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        Relative Dating Principle of original horizontality Layers of sediment are generally  deposited in a horizontal position Rock layers that are flat have not  been disturbed Principle of cross-cutting  relationships Younger features cut across older  features
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    Cross-Cutting Relationships Figure 8.4
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    Relative Dating Inclusions An inclusion is a piece of rock that is  enclosed within another rock Rock containing the inclusion is  younger Unconformity An unconformity is a break in the  rock record produced by erosion and/ or nondeposition of rock units
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    Relative Dating Unconformity Types of unconformities Angular unconformity Tilted rocks are  overlain by flat-lying rocks Disconformity —Strata on either side of  the unconformity are parallel  Nonconformity —Metamorphic or  igneous rocks in contact with  sedimentary strata
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    Fossils: Evidence of Past Life Fossil  = traces or remains of  prehistoric life now preserved in rock Fossils are generally found in 
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This note was uploaded on 09/14/2011 for the course EAS 120 taught by Professor Svec during the Fall '08 term at Moraine Valley Community College.

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Ch08_Outline - Chapter8 GeologicTime HistoricalNotes Catastrophism JamesUssher,mid1600s,concluded old Moderngeology Uniformitarianism " Histor

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