Lecture_6_Other_Structures

Lecture_6_Other_Structures - Other Sedimentary Structures...

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Other Sedimentary Structures Lecture Outline I.Macro-scale features II.Bed-scale features III.Deformation structures IV.Surface structures V.Sole structures VI.Biogenic structures Reading Assignment: Boggs, Chapter 4: 74-81, 91-116.
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Macro-Scale Features Overall bedding Channels, Scour & Fill Lateral accretion Large-scale deformation
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Bed Scale
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Bed Shape
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Channels, Scour & Fill
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Lateral Accretion
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Syndeformation Structures
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Deformation Features – Bed Scale Causes: earthquakes, salt dissolution, downslope movement. Bed resistance by lithology – mudstone vs. sandstone
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Bed-Scale Features Special structures related to bedforms Lenticular to flaser bedding Herringbone structures Interference ripples Grading Normal Inverse Varves
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Lenticular, Flaser & Wavy Bedding
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Which One?
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Herringbone Bedding Caution: Herringbone or set edges?
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Interference Ripples
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Grading: Normal & Reverse
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Varves
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Penecontemporaneous Deformation Load features Flame structures Fluid-escape
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