Delaware River Valley and Kittatinny Mountain Region
The Valley and Ridge region in western New Jersey and eastern Pennsylvania
is a continuation of the general stratigraphy and structure of the Hudson
Valley and Catskills region with some noticeable exceptions (Figure 72).
The primary clastic sediment source areas during the Taconic and Acadian
Orogenies were to the northeast in the New England region. As a consequence,
the coarse clastic units grow progressively thinner and finer grained.
In contrast, the marine mudrocks and carbonate units generally grow progressively
thicker toward the southeast where shallow inland seas invaded the Appalachian
Basin region for longer periods of time. In addition, the structural deformation
associated with the Alleghenian Orogeny grow progressively greater to
the south. North and west of Kittatinny Mountain the great folds of the
Valley and Ridge steadily flatten out. North of the New York/Pennsylvania
border, the structural deformation is limited to a series of very gentle,
broad anticlines and synclines. Many of these anticlinal structures are
host to oil and gas reservoirs that are largely depleted after nearly
a century of production.
|Figure 72. Map of localities on Kittatinny Mountain and in the surrounding
region along the New Jersey/Pennsylvania border.
Route 209 continues to follow southward along the same outcrop belt of
the less erosionally resistant shale and limestone beds of the Devonian
Helderberg, Tristates, and Hamilton Groups. This valley, called the Port
Jervis Trough, is a continuation of the same valley followed by Route
209 southward from the Catskills region of New York. Between Port Jervis
and Stroudsburg, Pennsylvania, the Delaware River follows the strike of
this belt of Lower and Middle Devonian strata. The rocks are steeply dipping
toward the west. To the east, the Silurian Shawangunk Formation forms
the crest of Kittatinny Mountain, and to the west, the Late Devonian Catskill
Group forms the erosionally dissected plateau of the Pocono Mountains.
Much of the Delaware River Valley and Kittatinny Ridge in New Jersey are
part of the Delaware Water Gap National Recreation Area.