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Geology 3120 - Describing Folds

Geology 3120 - Describing Folds. Outline. Terms For Describing Folds Parasitic Folds Vergence. Initial Layer Cake. Direction of Closing. inflection point. inflection point - change in curvature (i.e., concave to convex). Convexity and Age of Beds.

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Geology 3120 - Describing Folds

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  1. Geology 3120 - Describing Folds

  2. Outline • Terms For Describing Folds • Parasitic Folds • Vergence

  3. Initial Layer Cake

  4. Direction of Closing inflection point inflection point - change in curvature (i.e., concave to convex)

  5. Convexity and Age of Beds • Anticline - a fold that is convex in the direction of youngest beds • Syncline - a fold that is convex in the direction of oldest beds

  6. Determining the Fold Axial Surface

  7. Determining the Fold Axial Surface

  8. Profile Plane of a Fold

  9. Interlimb Angle Five Categories: Gentle Open Close Tight Isoclinal

  10. Angularity of Interlimb Angle

  11. Cylindrical or Non-Cylindrical Folds non-cylindrical fold

  12. Attitude of Axial Surface

  13. Fold Symmetry

  14. Fold Harmonics

  15. Parasitic Folds Parasitic folds always verge towards anticlines and away from synclines

  16. Parasitic Folds Parasitic folds verge towards anticlines and away from synclines

  17. Parasitic folds verge towards anticlines and away from synclines

  18. Facing

  19. Vergence

  20. Vergence

  21. References Most figures from: http://earth.leeds.ac.uk/folds/describing/folddesc.htm

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