Rocky Hill Ridge, also known as the Mount Lucas-Rocky Hill Ridge, named after Lucas Voorhees, an 18th-century landowner, is a
diabase
Diabase (), also called dolerite () or microgabbro,
is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-gra ...
trap rock
Trap rock, also known as either trapp or trap, is any dark-colored, fine-grained, non-granitic intrusive or extrusive igneous rock. Types of trap rock include basalt, peridotite, diabase, and gabbro.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A ...
ridge
A ridge is a long, narrow, elevated geomorphologic landform, structural feature, or a combination of both separated from the surrounding terrain by steep sides. The sides of a ridge slope away from a narrow top, the crest or ridgecrest, wi ...
running west to east in the
US State
In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...
of
New Jersey
New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
. Diabase intrusions form
Baldpate Mountain and Pennington Mountain, the
Mount Rose extension of the Mount Lucas-Rocky Hill ridge, and part of the
Sourland Mountain
Sourland Mountain is a long ridge in central New Jersey, U.S., extending from the Delaware River at Lambertville to the western end of Hillsborough Township near the community of Neshanic, through Montgomery Township and into Hopewell Tow ...
s. The Ridge is long and continues across the
Millstone River
The Millstone River is a tributary of the Raritan River in central New Jersey in the United States.Gertler, Edward. ''Garden State Canoeing'', Seneca Press, 2002.
The Millstone River begins in western Monmouth County, New Jersey, Monmouth Co ...
, just below
The Georgetown Franklin Turnpike, as the Ten-Mile Run Mountain and Lawrence Brook Mountain. The western section of the ridge, which runs to the northwest to
The Sourlands (although not connecting with it because of the Hopewell Fault), is the
Mount Rose section of the ridge.
[Widmer, Kemble. ''Geology of Ground Water Resources of Mercer County''. New Jersey Geological Survey, 1965.]
References
Ridges of New Jersey
Igneous petrology of New Jersey
Landforms of Mercer County, New Jersey
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