20 THE GEOLOGICAL STRUCTURE, ETC. 



As showing the dip of the above described beds, the 

 follov/ing passage may be quoted : — 



" The several borings for artesian wells which have been 

 " made to the south-east of the marl belt, confirm the conclusions 

 " which had before been reached as to the dip of the Cretaceous 

 " strata of Southern New Jersey ; and borings on the borders of 

 " the ocean, and even out on the sand beaches, which are some 

 " miles from the upland, show that the strata outcropping at the 

 " high ground in the marl region are continued without change 

 " or disturbance of their regularity, as far out as these borings 

 " have been made."* 



The succeeding Tertiary beds for the most part consist of 

 marls, clays and sands. 



An artesian well at Winslow, Salem County, penetrated 

 the Tertiaries to a depth of 335ft., and after passing through two 

 thick beds of sand, respectively 9oft.and 107ft. thick, separated by 

 impervious clays, was carried down 15ft. in pure green sand. 

 These two thick beds of sand, known as " Glass Sands," form no 

 less than one-fourth of the whole of the New -Jersey Tertiaries, 

 and supply the bulk of the Vt'ater from this formation. 



Another well at Atlantic City attained a depth of 1,398ft., 

 and obtained its water from a bed of white sand met with at a 

 depth of 1,119ft., after passing through nothing but impervious 

 clays and marls. Not far from the Atlantic City Avell, another 

 was sunk to a depth of at least 1,125ft., but no particulars are 

 available. 



The dip of the Tertiary Rocks in New Jersey is to the south- 

 east, at from 20ft. to 40ft. per mile. 



From the above it will be seen that the artesian wells in 

 the State of New Jersey fall into two main groups. First, those 

 associated with Tertiary strata ; these are necessarily located 

 upon the ocean side of the State. In these beds, eight water- 

 bearing horizons have been proved. At three localities, Beach 

 Haven, Atlantic City, and Ocean City, on the sea coast, only a 

 few feet above the high water mark ; the lowest horizon has 

 been pierced at depths varying from 575ft. to 720ft. The wells of 

 the second group are associated with Cretaceous strata. These 

 are located along a belt from 15 to 20 miles long, bordering the 



'Annual Report of the State Geologist of New Jersey, for the year 188J; p. 21. 



