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-graine ...

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 or a mountain ridge is a geographical feature consisting of a chain of mountains or hills that form a continuous elevated crest for an extended distance. The sides of the ridge slope away from the narrow top on either side. The line ...

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 sove ...

New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...

. Diabase intrusions form

Baldpate Mountain Baldpate Mountain is a peak in the New York–New Jersey Highlands of the Reading Prong of Upper Pohatcong Mountain in Warren County, New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United State ...

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, 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 Township in ...

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 and flows westward throu ...

, 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 The Sourlands is a region in the US state of New Jersey that includes portions of Hunterdon County, Mercer County and Somerset County. It is centered on Sourland Mountain and comprises parts of Lambertville, East Amwell, West Amwell, Hillsbo ...

(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 {{MercerCountyNJ-geo-stub