Stratigraphic Sequences

Changes in Sea Level

• Eustatic Sea Level Changes
  
  - Climate (ice ages)
  

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  - Tectonic (development of mid-ocean ridges)
  
  Figure 3.14, p. 50
  
• Local Sea Level Changes
  
  - Uplift
  - Subsidence
  

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Regression (offlap sequence)

Transgression (onlap sequence)

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Factors

- Sedimentation Rate
- Change in Relative Sea Level

- subsidence rate
- rate of eustatic sea level change

Examples

Eustatic Sea Level is Constant

- Sedimentation > Subsidence Rate - Regression
- Sedimentation < Subsidence Rate - Transgression

Sedimentation = Subsidence Rate

- Sea Level Rises - Transgression
- Sea Level Falls - Regression

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last updated 2-23-01

All original material copyright (c) 1998 by Annabelle Foos. All rights reserved.