geology 209 - GLGY209:INTRODUCTIONTOGEOLOGY What Is...

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GLGY 209: INTRODUCTION  TO GEOLOGY
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What Is Stratigraphy? Largely Stratigraphy is that branch of geology that studies strata architecture. stratum, -a (layer); graphia (layout, arrangement).
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A More Complete Definition Stratigraphy represents the description of all rock bodies forming the Earth's crust and their organization into distinctive and mappable units based on their inherent properties or attributes in order to establish their distribution and relationship in space and their succession in time and to interpret geologic history.
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Layer & Facies Terminations
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Deposition-Erosion-Deformation Modern strata  architecture is an  interplay between the  deposition, erosion and  deformation processes. Figure to the left  (above): White -erosion; Blue -accumulation  basin.
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Interpreting a Stratigraphical Succession Sedimentological data can be used to decipher the order of deposition of various sedimentary strata. Particular structures such as desiccation cracks (mudcracks), and ripple marks are of great value in recognizing the original position of the sea bottom.
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Ripple Marks
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Mudcracks Burrowings
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Interpreting a Stratigraphical Succession Normal Stratigraphical Succession Inversed Succession
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Relative Ages By Superposition We can determine the relative ages of the rocks in either left or right successions. But the whole left section can be either older or younger than the right section.
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Conformable Succession strata without depositional breaks. Non-Conformable Succession
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This note was uploaded on 01/10/2010 for the course GEOG 209 taught by Professor Georgescu during the Fall '09 term at University of Calgary.

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geology 209 - GLGY209:INTRODUCTIONTOGEOLOGY What Is...

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