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NEW YORK STATE MUSEUM 



dip southward away from the older rocks. Between Stonypoint 

 and Haverstraw, therefore, there is the most marked departure 

 from the northwesterly dipping, monoclinal structure. 



It has already been pointed out that a shallow syncline exists 

 near the Ladentown trap area. The beds nearest the border of the 

 formation dip eastward away from the older rocks, whereas f of a 

 mile to the east westward dipping conglomerates are found. The 

 extent of this eyncline is unknown. It certainly does not involve 

 the beds all along the border. Northeast of Ladentown there are 



'/* Mile. 



Fig. 10 Sections showing the supposed relations of the Ladentown trap to the adjoining 

 conglomerate. 



no exposures of sandstone or conglomerate for more than 5 miles, 

 but west of North Haverstraw the rocks all dip to the southwest 

 and west. Southwestward at Biauvelt's foundry and Crum's 

 quarry the conglomerate beds appear to dip northwestward to- 

 ward the older rocks, and at Suffern there is no doubt as to the 

 northwestward dip and the absence of the synclinal structure. 



Faults 



The question of faults in the sedimentary beds is a perplexing 

 one. Owing to the absence of any well defined horizon in Rock- 

 land county which can be readily recognized, and to the glacial 

 drift which conceals so much of the rock surface, it is practically 

 impossible to locate any faults in these beds save where the actual 

 fault plane is exposed in a cliff or artificial section. In New 

 Jersey faults of great magnitude are known to traverse the for- 



