Plate 



W. J. Miller, photo 

 View showing contact lietween Grenville limestone and granitic syenite 

 as seen from across the Hudson river one-fourth of a mile north of the 

 ferry (southwest of Moon mountain). The smooth ledge at the river's edge 

 on the left and another toward the upper right hand corner are parts of 

 a single mass of syenite mostly concealed by the trees. The other rock is 

 Grenville limestone (white) with numerous closely involved streaks and 

 bands of hornblende (dark) gneiss. The sharp contact between the svenite 

 and Grenville is not well brought out in the picture. 



