2. The story of Tucson extensional geology

6. Undeformed granite Mylonite

7. Low strain High strain

13. Normal faults throughout - cut foliation and other ductile structures

14. Normal fault

15. Foliation- not sedimentary layering Measurable like bedding-good first indication of direction of ductile deformation

16. Mylonites Porphyroclasts Gneissic banding Rotated crystals

17. Fractured fold - top to the south

19. S C

20. Top to the south sense of shear

23. Ductile first Brittle later

25. X-cutting dike - seals all the ductile deformation- an absolute age on this basaltic material would constrain the end of ductile deformation

27. Ductile deformation top to the south is given by foliation (direction), sense of shear indicators (folding, S-Cs) and lineation Brittle is overprinted- low angle normal faults cutting the old foliation

30. Sequence of events:

31. The strength versus depth issue