to Cushetunk Mountain Nature Preserve. These mountains in Clinton
Township were formed by volcanic activity during the Triassic period over
160 million years ago. Lenni Lenape inhabitants referred to the area as
"Cushetunk", meaning "place of hogs", since wild hogs
roamed about. Settlers simply referred to it as "hog mountain".
Since vast boulders of Diabase rock made farming unsuitable, attention
was focused on timber and logging practices. The natural bowl formation
of the valley made the construction of the Round Valley Reservoir quite
ideal. Several farms contained in the valley were purchased by the state
and the area was flooded in the 1960's. At an average depth of 160’
below sea level, the reservoir is the deepest body of water in New Jersey.