EARTH238 Lecture Notes - Lecture 11: Anticline, Syncline
30 Aug 2016
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The apparent thickness that is parallel to the fold plane is the same all through the fold (constant apparent thickness: intrafolial folds. Highly deformed, evidence of folding is destroyed but some local areas preserved. Fold lines do not appear to connected to anything. Find two points of the same dip and connect: these will be on either boundary of the fold. Class 2 folds: dip isogons are parallel to each other, similar fold. Class 3 folds: dip isogons diverge to the top. Class 1 folds: dip isogons converge to center, parallel folds, class 1 b. Perpendicular to fold plane: class 1 c. Axial plane: can be vertical (upright), dipping (inclined/reclined) or horizontal (recumbent, defined by joining the hinge lines. Draw folds and connecting them up will create the axial plane. Cannot happen (if hinge line is vertical so does the axial plane) Reclined is a special case: hinge is going down the dip, parasitic folds.
