GEOLOGY OF THE NEW YORK CITY AQUEDUCT 255 



63 Delancey street west of Forsyth 

 Surface elevation 43.2 feet 



Rock floor —141 feet. Inwood limestone at 80° — very low 

 saving of core 

 "^2 Delancey street 121 feet east of Forsyth 

 Surface elevation 42.6 feet 

 Rock floor -122 feet. Very noncommittal rock, one piece very 



good Fordham and the rest not decidedly any special type 

 Classified as Fordham on this basis. Same behavior to bottom 

 -109 feet 

 81 Delancey street and Eldridge 

 Surface elevation 41.7 feet 



Rock floor -98 feet. Rock is typical Fordham gneiss — banded 

 and very micaceous — to bottom —123 feet 

 225 North side of Delancey street east of Eldridge street 

 Surface elevation 40 feet 

 Rock floor at el. -74 feet 



Fordham gneiss in good condition with interbedded limestone 

 at bottom at el. -550 feet to bottom at el. -671 feet 

 25 Delancey street between Eldridge and Allen streets 

 Surface elevation 40.6 feet 



Rock floor -68.3 feet. Banded Fordham gneiss — sound rock 

 — dip about 45° 

 233 South side of Broome street east of Allen street 

 Surface elevation 42 feet 

 Rock floor at el. -96 feet 



Fordham gneiss with good core recovery down to el. -200 feet 

 This hole is also known as 302 under a subsequent contract 

 85 Delancey street 



Surface elevation 38.7 feet 



Rock floor -82.3 feet. Banded Fordham gneiss — dip about 

 60° or less — bottom at -171 feet 

 223 Grand street east of Allen street 

 Surface elevation 41.2 feet 

 Rock floor at el. -123 feet 

 No core recovered in the first 140 feet 

 Inwood limestone with dip averaging about 45° from el. -303 



feet to bottom at el. -710 feet 

 Splendid core recovery 



