5 38 THE JOURNAL OF GEOLOGY. 
slopes—TYhe constructional forms are more distinct. In a num- 
ber of localities there are small but distinct spits, bars, and con- 
structional terraces, whose heights are closely accordant one 
with another. In many more localities, on the slope of the lake 
basin, or on the slopes of the islands which stood in it, there are 
beds of stratified, poorly rounded, but nevertheless distinctly 
water-worn gravel of strictly local origin. : 
Although not possessing distinct topographic form, these 
beds of local gravel agree in height, material, and structure 
with the well defined constructional terraces at other points. 
Where the gravel is not present in beds, scattered water-worn 
pebbles of local origin have been found at numerous places at 
levels corresponding with those of the well defined shore features. 
So general is their presence, as to warrant the belief that the 
shore gravel is much more nearly continuous about the 
former margin of the lake than superficial inspection would 
indicate. Nowhere have constructional shore features, beds of 
local gravel, or scattered water-worn pebbles of local origin been 
found about the lake basin, or on the islands in the lake, above 
the level at which the waters of the lake could have been con- 
fined. 
On Second mountain well-defined beds of local gravel have 
been found at thirteen points. The location and the height of 
the more important of these is shown on the accompanying 
map. With one exception they range in altitude from 344 to 
369 feet A. T., while single beds have a vertical range of as 
much as fourteen feet. A single bed of gravel is known ata 
lower level—about 300 feet. On the gneiss highlands between 
Bernardsville and Morristown, two small deposits of wave-worn 
gneiss pebbles are known at elevations of 371 feet to 380 feet. 
During the life of the lake, the cols of the ridge known as 
Long Hill were straits. At the same time, the crests above 
the cols constituted islands. Of these there was a series of nine. 
They were long and narrow, and rose above the water to heights 
not exceeding 125 feet. Débris carried by the waves and cur- 
rents along the shores of these islands, accumulated at their ends, 
