EVIDENCE OF MARGINAL FAULTS 



143 



the time his correlation paper was published, but the close agreement 

 of the recent observations may well be emphasized. The accompanying 

 sketch maps, reproduced from the several monographs, will indicate 

 how general is the agreement which has been reached. The writer has 

 modified the sketch of the New York-New Jersey area by adding a fault 

 along the eastern margin of the PaMsades, because not only does the topo- 

 graphic break at the border of the system seem to require such a fault, 



Figure 2. — Sketch Map of southern Part of New- 

 ark Area of Connecticut Valley. 



After Davis. Full lines represent faults. 



Figure 3. — Sketch Map of Newark Area of Pom- 

 peraug Valley, Connecticut 



Full lines represent faults. 



but parallel faults observed by the writer during the past summer on 

 New York island increases the probability of this structural break. The 

 object of the diagrams being simply to show the nature of the Newark 

 boundaries as determined by the different observers, violence has been 

 done in reproducing to the comparative scales of the areas concerned as 

 convenience has dictated. 



The general observation of marginal faults, considered with reference 

 to the probability that many have eluded observation, and also with re- 

 spect to the generally lower position of the Newark terrane, makes it 



