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Cylindrical Folds - Field Geology - Lab handouts

Study Notes, Geology

Post: July 18th, 2013
Description
Following are the major entities discussed in this lab handout Cylindrical Folds, Down Plunges, Cross Sections, Apparent Dip, Maintain, Structures, Fold Axis, Planes Tangent, Beds, Lines Parallel
Following are the major entities discussed in this lab handout Cylindrical Folds, Down Plunges, Cross Sections, Apparent Dip, Maintain, Structures, Fold Axis, Planes Tangent, Beds, Lines Parallel
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Contents
1 DOWN PLUNGE CROSS SECTIONS Main Topics A Cylindrical folds B Downplunge cross-section views C Apparent dip II Cylindrical folds A Surface of a cylindrical fold is parallel to a line called the fold axis. B Cylindrical folds maintain their shape for “long” (infinite) distances in the direction of the fold axis (as opposed to folds bending in the shape of a bowl); they are two-dimensional structures because they do not change in shape along the dimension of the fold axis. C Planes tangent to cylindrically folded beds intersect in lines parallel to the fold axis. D Poles to cylindrically folded beds are contained in the plane perpendicular to the fold axis, so taking the cross-product of the poles gives the orientation of the fold axis. III Down-plunge cross-section views A Down-plunge cross-section views can be obtained directly from a geologic map by looking obliquely at the map down a fold axis. B Beds appear in true thickness C Graphical technique 1 Find orientation of fold axi..

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