Plate 17 
2 <” o 
he upper view is of Potash mountain, locally called the “ Potash Kettle,” 
three miles north of Luzerne, Warren county. It is a remarkable feature 
of the landscape, the almost isolated mountain towering 1100 feet above the 
surrounding valleys. The rock is Precambric granite. 
The lower view shows several dark lava (diabase) dikes cutting gray 
syenite three-fourths of a mile northwest of Northville, Fulton county. 
Both rocks are of Precambric age. Photos by W. J. Miller 
