NEWARK ROCKS OF ROCKLAND COUNTY, N. Y. 



37 



Near West Nyack and again near Valley Cottage masses of 

 highly altered sandstone and shale are found inclosed in the 

 upper part of the trap, but there are no means of determining for 

 how great a distance the overlying shales are affected. 'Again a 



Feet 



to 



/s 



20 



Sandstone/ Tt 



So uth 



11 



N* X 



tI U 



,f rT ! n 



l r (| ,y 



"tt\o 



i » i ■ v.' 



Fig. 7 Contact of the trap and sandstone south of the entrance to the tunnel of the "West Shore 

 railroad near Haverstraw. The sandstones dip away from the observer westward. 



ledge of highly altered slate (hornfels) outcrops a few feet from 

 the trap along the road leading south from Long Clove. 



West of Short Clove no cases of metamorphism were noted, 

 though the sedimentary beds were often exposed close to the trap, 

 and in one locality, figure 8, the actual contact was seen. 



Other effects than metamorphism. In general the trap has no 

 effect on the sedimentary beds other than specified above. The 

 latter were not disturbed beyond the movement necessary to pro- 

 vide room for the intruded mass. The overlying beds were gently 

 raised, apparently without any great distortion. Where the trap 



