MATHS
StructuralGeology

# 32 structures that closely resemble planes are common

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32. Structures that closely resemble planes are common features of the crust of planet Earth. Examples include beds, joints, and faults. The attitude of a plane is expressed by its ___________ and __________. 33. What kinds of structures are represented by the following geologic map symbols?

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34. Please fill in the missing labels for the major faults shown in the following illustration.
Answers 1. (d) faults 2. force divided by area 3. distortions or changes in shapes 4. parallel 5. The direction of a line produced by the intersection of a dipping and horizontal plane. Strike is normally given as a direction relative to north. Examples include N20W, N45E, etc. Dip is the angle between an inclined and horizontal plane measured in a plane that is at right angles to strike. 6. 90 7. above 8. The White Pine is on the footwall block. The Maple is on the hanging wall block. A normal fault is illustrated. 9. below 10. contact 11. reverse 12. normal 13. The Willow is on the hanging wall block. A reverse fault is illustrated. 14. right-lateral strike-slip fault 15. left-lateral strike-slip fault 16. left-lateral strike-slip fault 17. right-lateral strike-slip fault 18. curviplanar 19. hingeline 20. axial surface 21. bisects 22. axial surface 23. hingeline 24. The limbs of the fold. 25. upward 26. downward 27. synclines 28. anticlines 29. (d) is a unit of length 30. remain distorted or strained 31. regain its original shape and volume 32. strike and dip 33. a. anticline, b. syncline, c. strike and dip of bedding dipping 25 degrees 34. a. San Andreas fault, b. San Jacinto fault, c. Rose Canyon fault, d. Elsinore fault, e. Imperial fault
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