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The Preakness Range is a range of the trap rock Watchung Mountains on the western edge of the Newark Basin in northern New Jersey.A large portion of this range is included in High Mountain Park Preserve, offering miles of hiking trails with vistas overlooking New Jersey and New York City.
The hill is composed of Preakness Mountain Basalt, making it the equivalent of Second Watchung Mountain in the New Germantown complex. [7] The thickness of basalt in this outlier is estimated at close to 425 ft (~130 m).
The Feltville Formation rests conformably above the Orange Mountain Basalt and below the Preakness Basalt, placing its deposition somewhere between approximately 199 and 196 million years ago during the early Jurassic stage known as the Hettangian.
Third Watchung Mountain begins with Packanack Mountain, part of the Preakness Range. The Pompton River separates the south end of Pakanack from the beginning of Towakhow Mountain or Hook Mountain, which runs west-northwest and then turns south to form a curve encircling the Great Piece Meadows along the Passaic River, ending near Pine Brook.
High Mountain Park Preserve is a protected area of the Preakness Range of the Watchung Mountains in Wayne, New Jersey, United States. Established in 1993, it comprises 1,153 acres (5 km 2) of woodlands and wetlands owned and managed by The Nature Conservancy. It is one of the largest tracts of conserved land in northern New Jersey.
The main ridge of the mountain is primarily composed of Preakness Basalt, being an extension of Second Watchung Mountain, but the northeast corner of the mountain is composed of Orange Mountain Basalt, as the ridge of First Watchung Mountain emerges from surrounding glacial sediments along the north side of main ridge.
The Towaco Formation rests conformably above the Preakness Mountain Basalt and below the Hook Mountain Basalt, placing its deposition somewhere between approximately 198 and 197 million years ago during the early Jurassic stage known as the Hettangian.
In New Jersey, more basalt flows are evident with several named formations including the Hook Mountain Basalt, the Preakness Basalt, and the Orange Mountain Basalt. Diabase is prominently displayed along the Hudson River in the Palisades Sill .