534 LTE JiOOTINAL EOLA GT OL OG I. 
the lake has been called into question, recent work has shown 
that Professor Cook was right in his main conclusion, although 
he was not in possession of the large body of facts which 
together demonstrate that conclusion. The lake occupied the 
basin-like area between the curving trap ridges, known as the 
Watchung or Orange mountains on the southeast, and the 
gneissic highlands on the northwest. Its northeastern end was 
in the vicinity of Little Falls, and its southwestern near Liberty 
Corner. 
The basin is now drained in a roundabout way by the Passaic 
river, which finally escapes across the Watchung mountains at 
Little Falls and Paterson. Of the Watchung mountains it was 
the Second which formed the rim of the basin in which the lake 
lay. 
The height of the Passaic river where it crosses this moun- 
tain at Little Falls is 158 feet. During the life of Lake Passaic, 
this outlet, as well as the valley now occupied by the Pompton 
river was choked by glacier ice. Leaving the Pompton yalley 
and the Little Falls Pass out of account, there is no other break 
in the rim of the lake basin lower than 331 feet. At this alti-. 
tude there is a pass across the enclosing trap ridge at Moggy 
Hollow, about two miles west of Liberty Corner, at the south- 
western end of the basin. This outlet regulated the level of the 
lake for a considerable period of its history. 
Within the area of the lake there are several trap ridges, of 
which Long Hill, extending from Chatham to Basking Ridge, is 
the most important. Its general course corresponds with the 
longest diameter of the lake. The lake basin is divided in the 
direction of its shortest diameter into two nearly equal parts by 
the terminal moraine between Chatham and Morristown. 
The record of itself, which Lake Passaic left, consists princi-. 
pally of (a) shore features, (4) berg deposits, (c) lacustrine 
deposits, (7) a slight difference in the nature of the till within 
the lake basin and of that without. Most reliance is placed upon 
the shore features, but the other lines of evidence have much 
corroborative weight. 
