Lab7_GeoTime

Lab7_GeoTime - Geologic Time The Geological Time Scale...

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Geologic Time Geologic Time
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The Geological Time Scale Composite of stratigraphic records that geologists use to determine history of the Earth. Relative and absolute dating methods are used to determine the age of rocks. Relative dating: using relationships between rocks to determine a sequence of events Absolute dating: numerical age given in years or years before present
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The Precambrian makes up ~75% of Earth history Eons Eras
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Eras Periods
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Periods Epochs
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Relative Dating 1) Principles of Original Horizontality Layers deposited horizontally Youngest layers on top
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Relative Dating 2) Principle of Lateral Continuity Rock strata are continuous
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Relative Dating 3) Principle of Inclusions A younger layer may contain pieces of an older layer (inclusion)
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Relative Dating 4) Principle of Cross-cutting relationships Any feature that cuts across a rock layer must be younger examples: -Faults -Igneous body -Unconformities
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Relative Dating Gap in the geologic record during which no sediment
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This note was uploaded on 02/03/2012 for the course GEOL 110 taught by Professor Centorbi during the Fall '08 term at Maryland.

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Lab7_GeoTime - Geologic Time The Geological Time Scale...

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