SECTION OF STATEN ISLAND. 

 Plate 4. 



1st Granite. — {Plate 4, fig. !.) This is seen at 

 the south side of the ferry wharf, on the shore, 

 between high and low-water mark at Tompkins- 

 ville, this rock differs from the New York Granite, 

 and is what is called Graphic Granite, it has a 

 large vein of white translucent quartz running 

 through it ; fine specimens may be obtained here. 



2nd Serpentine. — {Plate 4, fig. 2.) This forms 

 the highest hills on the island, it is similar to the 

 Serpentine of Hoboken, but that no Hydrate of 

 Magnesia has as yet been found, but abundant 

 veins of the Carbonate. This Carbonate was 

 brought up, by the sinking of a shaft (which was 

 done by some dreamers after riches) in a valley, 

 about four miles from Tompkinsville, on the south 

 side of the turnpike. Crystals of the mineral 

 since called Marmolite by Mr. Nuttal, were found 

 imbedded in the Carbonate of Magnesia. It would 



