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# Geometry of folds

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Fold & its classification
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# Geometry of folds

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### Geometry of folds

1. 1. Geometry and elements of fold
2. 2. The bending of rock strata of plastic nature due to compressional forces acting horizontally towards a common point or plane from opposite directions is known as folding. INTRODUCTION
3. 3. It results in the crumbling of strata , resulting in a wavy formation on the surface of the earth , which are known as folds. Folds are described by their form & orientation. CONTINUE...
4. 4. The stretch of the rock beds lying between any crest and any of the adjacent troughs on either sides is known as the limb of the fold. The limb may be then redefined as the fold segment between a hinge line and the adjacent inflection line. 1.LIMBS
5. 5. A point can be found where curvature is maximum is called hinge point. When rocks occur in a sequence & their all hinge points are joined together , they make a line , called the hinge line. 2.HINGE
6. 6. An axial plane is that imaginary plane that passes through all the points of maximum curvature in a folded sequence. It may be vertical , inclined or horizontal in nature. 3.AXIAL PLANE
7. 7. A line drawn parallel to the hinge line of a fold. A precise definition is the line representing the intersection of the axial plane of a fold with any bed of the fold. 4.AXIS OF A FOLD
8. 8. The angle of inclination of the fold axis with the horizontal as measured in a vertical plane is termed the plunge of the fold. In other words , plunge is the angle which this line makes with a horizontal plane. 5.PLUNGE OF A FOLD
9. 9. Crest-Highest points in an uparched fold. Trough-Lowest point in a downarched fold. Inflection point-A point on a fold at which the fold changes from syncline to anticline or vice versa. 6.CREST,TROUGH & INFLECTION POINT
10. 10. Engineering & general geology-Parbin Singh. A textbook of geology-G.B.Mahabatra https://en.wikipedia.org/wiki/File:Flank_ %26_hinge.PNG https://en.wikipedia.org/wiki/File:Agiosp avlos_DM_2004_IMG002_Felsenformati on.JPG REFERNCE
11. 11. THANK YOU A-TEAM