Sedimentary Structures Flashcards by Teresa Izabella

Fysiske, biologiske og kemiske strukturer

Fysiske: Krydslejringer, bølgestrukturer, flute marks.

Biologiske: Bioturbation, fodspor.

Kemiske: Evaporitkrystaller.

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Sole Marks

Bunde af sedimentlag med eroderede aftryk fra strømninger.

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Ripples vs. Dunes

Ripples: Små, skala under 10 cm.

Dunes: Større, dannes ved stærkere strømninger.

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Current vs. Oscillatory Ripples

Current: Asymmetriske, viser strømretning.

Oscillatory: Symmetriske, dannet af bølger.

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Lower vs. Upper Flow Regimes

Lower: Ripples, dunes.

Upper: Flade lamineringer, antidunes.

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Cross-Bedding Formation

Skyldes sedimenttransport på skrå flader i ripples/dunes.

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HCS og SCS

Hummocky cross-stratification (stormbølger)

Swaley cross-stratification (mindre bølger)

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Bouma Sequence

En teoretisk model for, hvordan sedimenter aflejres i en turbiditstrøm.

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Tide-dominated Environments

Flettede kanaler, flaskeformede sandbarrer.

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Sedimentary Structures Flashcards

(9 cards)