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Lambertville, Hunterdon Co., New Jersey, USA

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Latitude & Longitude (WGS84): 40° 21' 57'' North , 74° 56' 36'' West
Latitude & Longitude (decimal): 40.3658332824707, -74.9433364868164

Ref.: NJ State Geol. Annual Rpt. (1893):433.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Regional Geology

Jurassic145 - 201.3 MaJurassic plutonic: mafic rocks

Plutonic: mafic rocks

Early Jurassic - Late Triassic174.1 - 237 MaPassaic Formation gray bed

Major:: {fine-grained mixed clastic},Minor:: {siltstone},Incidental:: {black shale, sandstone}

Passaic Formation gray bed - Upper Triassic gray lake deposits (Trpg) consist of gray to black silty mudstone, gray and greenish- to purplish-gray argillaceous siltstone, black shale, and medium- to dark-gray, argillaceous, fine-grained sandstone and are abundant in the lower half of the Passaic Formation. Gray lakebeds occur in groups of two to five cycles although they also occur as single cycles in some parts of the formation. Several lakebed sequences consisting of one or two thick groups of drab-colored beds as much as 30 m (98 ft) thick or more can be traced over tens of kilometers. Many gray-bed sequences are locally correlated within fault blocks; some can be correlated across major faults or intrusive rock units. Thickness of the (entire Passaic) formation between Sourland Mountain and Sand Brook syncline is about 3,500 m (11,483 ft).

Part of the Brunswick Group. This unit's description is combined with JTRp (Passaic Formation) on the printed map. However, it is mapped seperately, so the description has been separated into two records. Also, this unit is called the 'gray bed' because that is what is used in the digital map.

Triassic201.3 - 252.17 MaTriassic mixed volcanic, volcaniclastic and sedimentary rocks

Mixed volcanic, volcaniclastic and sedimentary rocks

This designation includes Precambrian iron-formation-bearing sedimentary and volcanic sequences, as well as mixed sedimentary and volcanic or volcaniclastic sequences.

References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

12 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
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