546 THE JOURNAL OF GEOLOGY. 
thirty feet above the lower land to the south and west. North- 
ward, the plain passes into an irregular kame area, which it is 
believed marks the site of the ice edge during the formation of 
the delta. The water level corresponded to the present elevation 
Oli 210 @iF BOWS WSS. 
Between Boonton and Montville, southeast of The canal, there 
is another glacial delta having an average width of half a mile or 
less, and a length of two miles. Towards the upper limit of the 
plain, bowlders are numerous, and the surface somewhat irregu- 
lar. Patches of till are also present, apparently indicating that 
the ice lay on the higher ground to the northwest during the 
formation of the plain. The general level of this plain is less 
than 400 feet. Along much of the front of this delta, there is a 
lower terrace marking a stage of the lake 70 to 75 feet below the 
maximum stage. 
Just north of Montville there is a perfect example of a 
glacial delta, having an area of about a quarter of a square mile. 
The top slopes gently from north to south, and then falls off 
abruptly for 70 to 90 feet. Its margin or front is distinctly 
lobate. The water level here seems to have been along a line 
which now has an elevation of 397 to 398 feet. 
A mile and three-quarters north of Whitehall, and west of 
the Jacksonville schoolhouse, there is another small delta, whose 
frontal lobes are well marked. This deposit indicates a shore-line 
having an elevation of 408 to 410 feet. 
The largest and most typical delta of Lake Passaic occurs at 
Upper Preakness. Its surface is nearly flat. Its margin is 
strongly lobate, falling off abruptly 50 feet. Its area is about 
one square mile. Its elevation, 335 to 340 feet, indicates a lake 
stage about 70 feet below the maximum in this region. It is to 
be correlated with the lower terrace on the Boonton delta. Just 
north of this plainis a moraine-like kame belt, half a mile in 
width. The hillocks are of coarse material, and are often thickly » 
strewn with bowlders. At the same time that the Upper Preak- 
ness delta was building, the kame belt was probably formed just 
beneath the ice and at its irregular margin. 
ee eS 
