Lab 3_Intro PP - Geologic Events Occur on time scales of...

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Geologic Events Geologic Events Occur on time scales of millions of years Occur on time scales of millions of years Geologic time scale based on: Geologic time scale based on: relative age dating relative age dating absolute age dating absolute age dating
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Neogene Paleogene 23 Million
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Geologic Dating Geologic Dating Absolute Dating: Absolute Dating: Gives precise time measurements, like being 20  Gives precise time measurements, like being 20  years old years old Relative Dating: Relative Dating: Relating one fact or event to another, like  Relating one fact or event to another, like  knowing your father is older than you, but  knowing your father is older than you, but  younger than your grandfather. younger than your grandfather.
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Tools Used for Relative Dating Tools Used for Relative Dating Depositional sequences known as  Depositional sequences known as  strata strata Sequence stratigraphy Sequence stratigraphy Principles of stratigraphy Principles of stratigraphy Unconformities Unconformities Faunal succession Faunal succession
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Principles of Stratigraphy Principles of Stratigraphy Principle of Superposition :   younger strata  accumulate over older strata during the  deposition of sedimentary sequences Principle of Original Horizontality :    depositional sequences generally  accumulate in horizontal layers regardless  of the orientation of the underlying strata
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Principle of Original Continuity :   sedimentary  sequences generally accumulate in widespread,  blanket-like deposits Principle of Crosscutting Relationships :    igneous intrusions  are younger than host units  they penetrate Principle of Inclusion :   rock fragments within  igneous units or depositional sequences are older  than their hosts Principles of Stratigraphy Principles of Stratigraphy
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Igneous Intrusions Igneous Intrusions Dikes Dikes
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This note was uploaded on 03/27/2012 for the course GEOL 2413 taught by Professor Moody during the Spring '10 term at Texas A&M University, Corpus Christi.

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Lab 3_Intro PP - Geologic Events Occur on time scales of...

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