1. Folds “Mushroom fold” “Horizontal fold”
Rider Structural Geology GCHERMAN

2. Rider Structural Geology 310 2012 GCHERMAN

3. Rider Structural Geology 310 2012 GCHERMAN

4. Rider Structural Geology 310 2012 GCHERMAN

5. Rider Structural Geology 310 2012 GCHERMAN

6. A A’
Rider Structural Geology GCHERMAN

7. This view of the fold is the vertical cross-section
Fold plunges about 18o, therefore, cos 18 = .95
Fold-profile plane A’
18o
Vertical, cross-section plane
Fold axis
The profile view of the fold is looking down the fold plunge into the profile plane (90o to the plunge) A A’
Object grouped and scaled 95% in the vertical dimension
Rider Structural Geology GCHERMAN

8. Name:
Symbols: 60
Rider Structural Geology GCHERMAN

9. Name:
Symbols: 60
0.8
Tight, steeply-inclined, gently-plunging anticline
1.8
1.2 18 28
0.6
Open, upright, gently-plunging syncline
1.8
75o
90o
Width of unit A = 52o Actual thickness : sin 52 = x / 0.8 = 0.63
Plunge: TAN X = 0.63 / 1.2 = 28o
18o
60o
Profile
0.6
ILA = 76o
ILA = 30o
Profile
Rider Structural Geology GCHERMAN

10. Rider Structural Geology 310 2012 GCHERMAN

11. EXPLANATION: Anticline Syncline O - outlier I - inlier D – depression
C - culmination D O C O
Rider Structural Geology GCHERMAN

12. Rider Structural Geology 310 2012 GCHERMAN

13. Explanation: Hinge point Structure contours for a limb
Use the structure contours to figure out the limb dip, which is the same dip value for all limbs,
Rider Structural Geology GCHERMAN

14. Name:
Rider Structural Geology GCHERMAN

15. Name: z Y X z 260 Thickness: SIN 22 = z / 150 = 56 m 150 22o WISP FELL
Open, steeply inclined, horizontal anticline
Open, steeply inclined, horizontal syncline 44 20
Dip: TAN X = 20 / 40 = 26o