Ground-water divide; 

 September 1965 water levels 



Southern part of 

 water-budget area 



Grett' 



rM'"~^^i-'-'^outhern 



nearshore area 



Water-budget area 



5 5 10 15 20 25 MILES 



ll M l I I \ I I I 



_L 



_1_ 



Figure 11. Hydrologic areas and subareas on Long Island. After Franke and 

 McClymonds (1972, Fig. 2) . 



NORTH 



SOUTH 



ATLANTIC 

 OCEAN 



Clay Sandy clay, clayey 



Gravel 



Not to scale 



Figure 12. Section illustrating the geologic features of the ground-water 

 reservoirs beneath Long Island. After Franke and McClymonds (1972, Fig. 8). 



25 



