No waterfalls there.
You need mountains for waterfalls.
<SNIP>.
Sorry, Ben, NOT TRUE!
Granted, a waterfall cascading down a mountainside, like in Yosemite, or in Niagra, NY, is breathtaking and quite impressive, but the only geologic condition necessary for a waterfall is a geologic fault with a marked difference in height between the territory on either side of the fault. Of course, in order to have a waterfall, you will need "water" in the form of a stream or river that ran/runs perpendicular to the fault line(s).
Southern New Jersey is an alluvial plain created by the melting of the great, North American ice sheet, and the deposition of gravel and sand carried by the rush of water from the rapidly melting glacier.
Geologically speaking, northern New Jersey is much more interesting. The terminal moraine of the above--mentioned glacier is located behind (but on the premises of) Fairleigh Dickinson University in Madison, Morris County. It is easily identifiable from the road from Madison,through Florham Park, as one travels toward Columbia Tpk. It is located on part of the old Twombley Estate. Esso bought the estate, and sold the "upper half," with the mansion, orangerie, and some other buildings, which became the Florham--Madison Campus of F.D.U. Esso kept the "lower half," across the "Florham Park Road," and built a huge research center there (with a large, underground, computer centre, that used to run 7/24/365.).
A large portion of North Jersey underwent volcanic activity. The Watchung Mountains were the result. They are essentially "lava flows," which, in time, became tilted, thus forming the mountains. The "Palisades" with its six--sided basaltic prisms was, on the other hand, the result of a "volcanic intrusion" (between two geographic layers). Because the basalt cooled very slowly, large crystals were formed...
Now, if water were to run--off the edge of the Palisades, you'd have a waterfall... No "mountain building" needed!