1. Mecca Hills’ Painted Canyon
GLG455/598
Advanced Field Geology
Mecca Hills’ Painted Canyon
Structural geology of deformed sedimentary and basement rocks within the San Andreas Fault zone

2. View southeast over the Mecca Hills

3. Mecca Hills

4. Painted Canyon

5. Tent camping on the beach: $7/night x 2 camps
=$28/11 people ~ $3 each
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6. Logistics Depart Fwing loading dock at 4 pm on Friday.
Forecast from weather.com
Logistics
Depart Fwing loading dock at 4 pm on Friday.
Return early evening on Sunday night
Bring camping gear and field gear
We will provide kitchen system
Organize food groups (if desired) and purchase items before Friday

7. Nominal mapping area: transect 6.2 km long

8. Mapping exercise: Produce a geologic map along this transect which is mostly perpendicular to the major structures.
-Many strike and dips of faults and bedding plotted on the map
-Major stratigraphic contacts and basement contacts
-Rock descriptions

9. Generalized stratigraphy in the Mecca Hills
Basement: Highly sheared gneiss and granite of the Chuckawalla complex; Orocopia Schist

10. Unconformity or fault along Box Canyon

11. Nice folds and faults in Painted Canyon

12. Sedimentary structures in Plio-Pleistocene units

13. Some basement rocks are involved in the deformation

14. Structural planes See handouts and a couple of movies
See also Reynolds’ web sites:

15. Davis and Reynolds, 2000

16. Ragan and Arrowsmith, 2002

17. Ragan and Arrowsmith, 2002

18. Ragan and Arrowsmith, 2002

19. Strike and dip notation
Azimuthal
Quadrant
Dip/dip direction

20. Measuring strike and dip
Ragan and Arrowsmith, 2002

21. Ragan and Arrowsmith, 2002

22. Davis and Reynolds, 2000

23. Davis and Reynolds, 2000

24. Davis and Reynolds, 2000

25. Ragan and Arrowsmith, 2002

26. Davis and Reynolds, 2000

27. Basic steps in the preparation of a geologic cross section:
Choose appropriate line of section
Produce topographic profile along it.
Transfer marker attitudes (contacts and within units)
Correct for apparent dip in line of section (if line <75 degrees from strike)
Draw units; maintain stratigraphic thickness where possible; use deformation patterns observed from field to guide interpretation. Continue lines into air and below ground
Davis and Reynolds, 2000

28. Ragan and Arrowsmith, 2002
Davis and Reynolds, 2000

29. Davis and Reynolds, 2000