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SEQUENCE STRATIGRAPHY

TRANSGRESSION

  • Shoreline shift landward

  • Retrogradational pattern- fining upward

  • Feature name - Estuaries

  • Sea level rise

  • Deepening upward (Deep facies found at the top whereas shallow facies found at the bottom)

  • Transgressive system tract found - due to rapid increase in sea level

REGRESSION

  • Shoreline shifts seaward

  • either due to sedimentation - Normal regression

  • due to sea level fall - Forced regression

    Regression is of two types

1) Normal regression

  • Shoreline shift seaward due to sedimentation

  • Low stand system tract, High stand system tract

2) Forced regression

  • Shoreline shift seaward due to rapid fall in sea level

  • Falling stage system tract - rapid decrease in sea level

  • Fining upward - Retrogradational pattern

SYSTEM TRACTS

1) FSST - Rapid fall in sea level : Forced regression

2) LST - Sea level just start rising (initial stage when sea level start rises)

3) TST - rapid rise in sea level : Transgression (retrogradation pattern)

4) HST - Last stages of rise in sea level (progradation pattern)

OVERALL FIGURE

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