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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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Outline • Terms For Describing Folds • Parasitic Folds • Vergence
Direction of Closing inflection point inflection point - change in curvature (i.e., concave to convex)
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
Interlimb Angle Five Categories: Gentle Open Close Tight Isoclinal
Cylindrical or Non-Cylindrical Folds non-cylindrical fold
Parasitic Folds Parasitic folds always verge towards anticlines and away from synclines
Parasitic Folds Parasitic folds verge towards anticlines and away from synclines
Parasitic folds verge towards anticlines and away from synclines
References Most figures from: http://earth.leeds.ac.uk/folds/describing/folddesc.htm