SLA SS. TA SSVAHC, 547 
North of the kame belt is another but more irregular plain of 
sand and gravel, the surface of which seems to have been more 
or less modified, by the action of standing water. To have 
extended over it, Lake Passaic must have covered a surface 
which now has an elevation of 412 feet. 
A mile and a half west of Haledon, near Paterson, there are 
delta-like terraces at two levels. They mark water levels which 
now stand at 412 feet, and 340 feet respectively. In the vicin- 
ity of Caldwell, also, there is a somewhat extensive sand and 
gravel plain, which has a similar significance. 
Of the glacial deltas and terraces, those (az) at Montville, (0) 
west of Jacksonville, and (c) at Upper Preakness, are the most 
typical. The northern margins of the two last named have the 
irregular, hummocky surfaces characteristic of gravel beds, which 
were originally built against the ice, but which have since slipped 
and fallen down as the ice melted. In places the slopes still 
retain the irregularities of the ice mold in which they were cast. 
Several of the other plains pass into kame areas, which are 
believed to have been formed beneath the ice and at its irregular 
edge and to mark ‘the position of the ice front, at the time of the 
formation of the deltas. Inanumber of cases, kames of an older 
generation have been partially buried by the advancing front of 
the growing deltas. 
In addition to the deltas, there are a few small spits connected 
with what appear to be wave-cut terraces, and a few kames whose 
summits seem to have been truncated by the waves; but aside 
from the glacial deltas, the constructional shore forms are not 
conspicuous or decisive. The largest deltas within the moraine 
may have required far less time for their building, than the gra- 
vel beds along the trap ridges in the extra-morainic part of the 
lake. 
THE LACUSTRINE DEPOSITS OF LAKE PASSAIC. 
Iceberg deposits —Iceberg deposits in the extra-morainic part 
of the lake basin consist mainly of bowlders similar to those of the 
moraine. They are found frequently.up to altitudes of 340 feet, 
and more rarely up to the maximum level of the lake. Although 
