LAB6_folds_outcrop - Structural Geology Lab 6: I. Analysis...

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1 Structural Geology Lab 6: Analysis of Folds in Outcrop I. Lab Exercise on Fold Description and Geometry. A. Review of Fold Terms Hinge/ hinge line inflection point line of inflection median surface crest/trought crestal /troughal trace cylindrical noncylindrical fold axis symmetric/ asymmetric axial surface axial plane axial trace synform/antiform anticline/syncline overturned vertical fold reclined fold recumbent fold interlimb angle parallel fold similar folds dip isogons Ramsay's Classif. B. Drawing dip isogons 1. dip isogon: lines connecting points of equal dip between bedding planes in a fold 2. Method 1 using protractor 3. Method 2 using two see-through drawing triangles a. pick point on bedding plane b. use triangle to define line tangent to point c. slide triangle paralle itself til it touches tangent to next bedding plane d. make point on bedding plane 2, connect two points to form dip isogon e. repeat numerous times limb to hinge to limb of fold to derive set of dip isogons
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LAB6_folds_outcrop - Structural Geology Lab 6: I. Analysis...

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