42 , A GEOLOGICAL HISTORY. 



seen from other localities, (if we except the Ser- 

 pentine of Staten Island,) containing a larger 

 portion of Magnesia than common ; it is of a light 

 green colour, with variations, and having many 

 veins of Carbonate of Magnesia, running through 

 it ; the Hydrate of Magnesia, not being so plenty. 

 There are also some veins of Magnesian Carbonate 

 of Lime, a kind of Gurhofite, accompanying it, in 

 which, are seen the Hydrate in small scales. 

 Locality — Castle Point, as you go north, from the 

 ferry wharf, to that delightful walk " the Elysian 

 Fields." This has long been a favourite resort 

 for Mineralogists. There was once, at this locality, 

 near the shore, in the perpendicular cliff, a wide 

 seam filled up with a conglomerate of all the 

 surrounding rocks, as well as Serpentine cemented 

 together by a Carbonate of Lime and Magnesia. 



3d. Sandstone. — (See plate 2, jig. 3.) This 

 rock, is said to underly most of the state of New 

 Jersey, north of a line drawn from New Brunswick 

 on the Rariton, to Trenton on the Delaware, if 

 we except the most north-western part of the state, 

 which appears to be a Transition Limestone with 



by the great quantity of oxide of iron and other metallic oxides it con- 

 tained, which is the reason it has not been used for this purpose ; I had 

 a large product of impure Sulphate of Magnesia. 



