84 



FIG. 64. 



FIG. 65. 



FIG. 66. 



FIG. 67. 



What structure in the rocks beneath is indicated by the obser- 

 vations in each case ? 



2. Show by sketch maps the surface of the outcrops correspond- 

 ing to the beds shown in the cross sections (Figs. 68 to 71). Num- 

 ber the strata and show the dips. 



FIG. 68. 



FIG. 69. 



FIG. 70. 



FIG. 71. 



3. See Figures 45, 46, 47, 290, 291, and 414. Are the folds of 

 the competent or the incompetent type ? 



4. Show by sketch maps how the outcrops may be changed by 

 faulting along the lines represented in Figures 72, 73, and 74. Let 

 the faults be normal and inclined toward the right in each case. 

 Assume that the fault cliffs are cut down to a plain surface by 

 erosion. 



5. Explain the outcrops shown in Figure 75 and illustrate by 

 diagrams. 



