2. Is mounting that arises when a bend or arched
surface layer which was originally flat as a result
of the effect of the pressure forces is reflected in
the sedimentary rocks
3.
4.
5. 1- Fold Axis : The line is actually on the surface of the
folded top of the class and connecting the dots with a
then curvature of the surface layer maximum. fold axis
as well as the so-called joint line.
2- Fold Limb : Two layers, which form the sides of
fold and rub shoulders at the axis of fold
3- Axial Plane : Is the level that does justice to the angle
between the two wings of fold.
6.
7.
8.
9.
10.
11. CLASSIFICATION OF FOLDS
*On the basis of the direction of wing*
1-Anticline : Which converges suites fold
upwards, meaning that wing tend away from
the pivot level of the fold, and produces the
effect of tensile forces.
2-Syncline : And which converges suites fold
down any wing that tend towards the pivot
level Fold, it produces the effect of
compression forces.
12.
13. The Main Types Of Folding :-
1- Symmetrical Fold
2- Asymmetrical fold
3- Recumbent Fold
4- Overturned Fold
5- Dome
6- Basin
14.
15.
16.
17.
18.
19.
20. IMPORTANCE OF FOLDS
*You can determine the relative age of the
layers of folds in order to read the history of the
earth (to see the older and newer).
*Considered convex folds of the most important
geological structures suitable for the pool, where
the oil is usually congregate at the top of the fold.
21. HOW IS IT CAUSED?
Changes in shape and volume occur
when stress and strain causes rock to
buckle and fracture or crumple
into folds. A fold can be defined as a
bend in rock that is the response to
compressional forces. Folds are most
visible in rocks that contain layering.
24. WHAT IS IMPORTANT FOR ECONOMIC
SYNCLINE FOLDS :
1. ground-water rafting
2. collect mineral deposits such as
sediment phosphate.
25.
26. WHAT IS A BEND IN A LAYER OF ROCK CALLED?
A bend in a layer of a rock is known as a
fold, which is caused by compression that
leads to rocks either bending or
breaking. Folds that produce a type of
upward arch are known as an anticline
