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# Folding

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### Folding

1. 1. Landscape Folding
2. 2. What is folding? <ul><li>Folding is the process whereby two plates collide with each other where some of the layers of rock which make up the crust buckle and form folds. </li></ul><ul><li>Basically two types of fold </li></ul><ul><ul><li>Anticline </li></ul></ul><ul><ul><li>Syncline </li></ul></ul>
3. 3. Anticline <ul><li>Happens when the layers of rocks buckle upwards to look like an inverted ‘U’ </li></ul>
4. 5. Syncline <ul><li>Happens when layers of rock buckle downwards to look like a “U” </li></ul>
5. 7. Types of folds <ul><li>Symmetrical fold/simple fold </li></ul><ul><li>Asymmetrical fold </li></ul><ul><li>Overfold/Overturned fold </li></ul><ul><li>Recumbent fold </li></ul><ul><li>Overthrust fold </li></ul>
6. 8. Anticline and Syncline
7. 9. Symmetrical fold <ul><li>A fold where both limbs are equal in steepness because compression from opposite sides is equal. </li></ul>
8. 10. Asymmetrical fold <ul><li>Happens when one limb is steeper, because compression is greater from one side than the other. </li></ul>
9. 11. Overfold / Overturned Fold <ul><li>Happens when one fold is pushed over the other limb due to increasing compression </li></ul><ul><li>Both limbs are sloping in the same direction. </li></ul>
10. 12. Recumbent Fold <ul><li>Happens when limbs are nearly parallel to each other. </li></ul><ul><li>Axis is almost horizontal </li></ul>
11. 13. Overthrust Fold <ul><li>Extremely powerful compressional forces which causes recumbent fold to fracture </li></ul><ul><li>Upper part of the recumbent fold thrust forward along the plane of fracture </li></ul>
12. 14. Different folds Symmetrical fold Asymmetrical fold Overfold Recumbent fold
13. 15. Resultant landforms <ul><li>Fold Mountains. </li></ul><ul><li>How are fold mountains formed? </li></ul>