PHYSICAL AND GEOLOGICAL DESCRIPTION. 25 



water at 120 feet. There was no layer of clay found to 

 shut off the salt water. For the particulars in regard to 

 these wells, the survey is indebted to Mr. J. N. Bolles, 

 of Baltimore, a gentleman who has had extensive experi- 

 ence in boring Artesian wells in various parts of New 

 Jersey, as well as in the adjoining States. The remark 

 made by Mr. Bolles, that the gravel in the bottom of the 

 well at the Mount Vernon House is like that at Cold 

 Spring, should be noticed. Cold Spring, three miles north 

 of Cape Island, is noted for a large spring of fresh water 

 in the valley just north of the village. There is no 

 spring of fresh water on the Cape south of this; and 

 it appears to be thought by Mr. Bolles, and others 

 have expressed the opinion, that the gravel stratum, in 

 which the water comes to the surface at Cold Spring, 

 dips to the south, and is eighty or ninety feet below tide- 

 level at Cape Island ; and that the water in the Artesian 

 wells at the Island is from the same stratum which sup- 

 plies the spring at the former place. 1 am sorry to say 

 that I have not been able to get any other facts, which 

 would throw further light upon this point. 



§ Vert few boulders are to be found anywhere in the 

 coiinty; none in the southern part. In the vicinity of 

 Dennisville, particularly of North Dennisville, they are 

 more common than elsewhere. Several of them are in 

 sight of the road from Dennis to Port Elizabeth, and within 

 one or two miles of the former village. They are found 

 among the gravel on the ridges along the northwest border 

 of the Great Cedar Swamp; they are said to be found in 

 the gravel beneath the muck of the Cedar Swamp, and a 



