L07_Sed Structures I_Notes.doc

L07_Sed Structures I_Notes.doc - Lab 7 Sedimentary...

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Lab 7 Sedimentary Structures I Sedimentary Structures: large scale features (hand specimen or outcrop-scale) that provide information for environmental interpretations (i.e. water depth, energy, climate, specific environment, diagenesis, etc.) 1) primary sed structures – form as sediments are deposited 2) secondary sed structures – post depositional See manual p. 10-14 Types of Sedimentary Structures 1) Biogenic: burrows, tracks, trails (trace fossils) 2) Soft Sediment Deformation 3) Chemical: concretions, geodes, dissolution features, liesegang bands… 4) Bedding and Bedforms: crossbedding, laminations, ripple marks, etc. Bed – a layer of sediment or a package of sediment (laminae = small bed <1mm) Vs Bedform – surface expression of sediments being moved by air and water (ripples, dunes, flat bedform) Vs Bedding – cross-section expression of stacked of bedforms (ripple cross-strata, dune cross-strata, parallel laminations) Bedforms and Flow Regime (p. 15, 15A) Flow Regime –
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L07_Sed Structures I_Notes.doc - Lab 7 Sedimentary...

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