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New York - West Shore & Buffalo RR tunnel, Weehawken, Bergen Hill, Hudson Co., New Jersey, USA

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Latitude & Longitude (WGS84): 40° 46' North , 74° 1' West
Latitude & Longitude (decimal): 40.7666666667, -74.0166666667

A railroad tunnel (1881) through the Bergen Hill comprised of Palisades Diabase.

Mineral List

20 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Late Jurassic
145 - 163.5 Ma
Stockton Formation

Age: Jurassic (145 - 163.5 Ma)

Stratigraphic Name: Stockton Formation

Description: (Kmmel, 1897) - Light-gray, light-grayishbrown, yellowish- to pinkish-gray, or violet-gray to reddish-brown, medium- to coarse-grained arkosic sandstone and reddish- to purplish-brown mudstone, silty mudstone, argillaceous siltstone, and shale. Mudstone, siltstone and shale beds thicker and more numerous in central Newark basin west of Round Valley Reservoir. Sandstones mostly planar-bedded, with scoured bases containing pebble lags and mudstone rip-ups. Unit is coarser near Newark basin border fault, where poorly exposed, reddish-brown to pinkish-white, medium- to coarse-grained, feldspathic pebbly sandstone and conglomerate (Trss) and pebble to cobble quartzite conglomerate (Trscq). Maximum thickness of formation about 1,240 m (4,070 ft).

Comments: Newark Supergroup, Brunswick Group (Lyttle and Epstein, 1987). The Stockton Formation unit description on the map encompasses multiple units (TRs, TRss, and TRscq). The units were split into separate records and appropriate descriptions for each were used. Names for units is from digital map.

Lithology: Major:{siltstone mudstone}, Minor:{arkose,mudstone,siltstone,shale}, Incidental:{sandstone, conglomerate}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.


Manchester, J. G. (1931), The Minerals of New York City & Its Environs, New York Mineral Club Bulletin: 3(1).

Peters, Joseph J. (1984), Triassic Traprock Minerals of New Jersey, Rocks & Minerals (July-August): 59: 157-183.

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