Geology 001                                                                                        West Valley College

Physical Geology                                                                                  R. Lopez

Study Questions Chapter 6:

Geologic Structures and Geologic Maps


1)      Define the following:  Stress, Strain.

2)      Sketch the directions of forces on blocks being deformed by tensional, compressional, and shear stresses.

3)      What are the three fundamental ways in which rocks behave under stress and strain?

4)      Define these behaviors (Elastic, Ductile, and Brittle).  Under what conditions do Brittle, Ductile, and Brittle behavior occur?

5)      What is the elastic limit?

6)      How do faults and joints differ?

7)      What is fault gouge and fault breccia?

8)      Where is fault gouge or fault breccia found?

9)      What are hanging walls and footwalls, fault planes, and sense of motion of faults?

10)  What is the definition of strike?  Be able to determine strike from compass diagrams and from geologic maps like I did in lecture.

11)  What is the definition of dip? What is the definition of strike?

12)  Dip is always ______ to strike.

13)  What are dip-slip faults?

14)  Define Normal fault, Reverse fault, Thrust fault, Strike-Slip fault.

15)  Illustrate movement on normal, reverse, thrust, and strike-slip faults (be sure to indicate if your sketch is a map or cross-sectional view), and label the hanging wall and foot wall.  What type of stress associated with each.

16)  What are right-lateral vs. left-lateral strike-slip faults.

17)  What is Basin and Range topography.  Where in the USA is if found today?

18)  What are Horsts and Grabens?  Under what stress are they formed, and where is this type of geology most evident?

19)  Define the following: fold, anticline, syncline.

20)  Define hinge line, axial plane, fold limbs.

21)  Illustrate anticlines and synclines in cross section, and label the axial plane, hinge line, and fold limbs.

22)  What is Strike and Dip? What symbol is used?

23)  What are geologic maps?

24)  What are geologic contacts?

25)  What was included in your geologic map of Point Lobos?

26)  Know the geologic map symbols for strake and dip, anticlines, synclines, geologic contacts, and faults.

27)  Be able to determine the geologic structure of beds using statigraphic order.