NEW YORK. 



77 



66. The Laurentian rocks cover the whole of the country east of the Black River and the later 

 formations west of the river, the opposite sides forming the strongest contrast imaginable as to rocks, 

 soil, vegetation and population. 



67. At Watertown the banks of the Black River present fine sections of the limestone visible 

 from the car windows, showing the Trenton limestone, Black River limestone and the Birdseye 

 limestone. There is a mass forming the Black River sub-division, known to quarrymen as the seven 

 feet tier, lyine between the Birdseye and Trenton limestone. At the Isle LaMotte, near Chazy, in 

 Lake Champlain, it is a black marble, but at Watertown it is only suitable for ordinary purposes. 



