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NEW YORK STATE MUSEUM 



clined at low angles downward toward the next exposure of the 

 Precambric, whereas if they were restmg upon the latter in a depo- 

 sitional relation, they ought to slope upward to them. If, however, 

 dropped by faulting, they would readily assume the relations ob- 

 served. 



Faults in the Precambric rocks. Faults are sometimes shown 

 by the brecciated condition of the ancient crystallines. Figure 12 

 is a sketch to scale of an exposure of anorthosite south of the road, 

 and near the Woolen mill, a mile or less west of Elizabethtown, 

 where the exposures shown in figure 7. page 41, were mapped. The 

 star upon this last named figure shows the exact spot. The 



to ft. 



^*'. 



Fig. 12 Faulted and crushed anorthosite near Woolen Mill i mile west of Elizabethtown. 

 The exact locality is shown by a star in the lower part of figure 7. 



anorthosite has been crushed to a blocky breccia whose larger pieces 

 are embedded in a sheared and schistose matrix derived from the 

 comminuted particles. Besides the general crush, it would appear 

 as if the upper portion of the diagram had been moved northwest 



