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Interstate 95 and George Washington Bridge Lower Level roadcut, Fort Lee, Bergen Co., New Jersey, USA

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Latitude & Longitude (WGS84): 40° 51' 3'' North , 73° 58' 14'' West
Latitude & Longitude (decimal): 40.85083,-73.97056
GeoHash:G#: dr72ku8m3
Locality type:Road Cutting
Köppen climate type:Cfa : Humid subtropical climate

This locality was a massive, deep roadcut into the Palisades diabase cliffs to accomodate the interstate highways and the lower level installation of the George Washington bridge. The excavations encountered some coarsely crystallized and vuggy areas of the diabase.

Mineral List

33 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 Macrostrat.org

Early Jurassic
174.1 - 201.3 Ma

ID: 2750020

Age: Early Jurassic (174.1 - 201.3 Ma)

Description: Fine-grained to aphanitic dikes; medium- to coarsegrained, subophitic discordant stock-like intrusions of dark-greenish-gray to black diabase; and plugs of dark gray, concordant to discordant sheetlike, medium- to coarse-grained, quartz-rich to albite-rich granophyre (map unit Jg). The chilled margins of diabase masses are aphanitic to very fine grained. Diabase is dense, hard, and sparsely fractured. It is composed mostly of plagioclase (An50-70), clinopyroxene (mostly augite) and magnetiteñilmenite. Accessory minerals include apatite, quartz, alkali feldspar, hornblende, titantite, and zirocon. Olivine is rare. Within about 200 m (655 ft) above and 150 m (490 ft) below the large diabase sheets, red mudstones are typically metamorphosed into indurated, bluish-gray hornfels commonly with clots or crystals of tourmaline or cordierite, whereas argillitic siltstone is metamorphosed into brittle, black, very fine grained hornfels, Sheetlike intrusions are as much as 360 to 400 m (1,180-1,310 ft) thick. Dikes range in thickness from 3 to 15 m (10-50 ft) and several kilometers (miles) long. Thickness of the stocklike bodies is unknown.

Comments: Units Jd and Jg are described together on printed map. Used same description for both, but split them into seperate units.

Lithology: Major:{plutonic}

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]

201.3 - 252.17 Ma

ID: 3187752
Mesozoic intrusive rocks

Age: Triassic (201.3 - 252.17 Ma)

Stratigraphic Name: Palisades Sill

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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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Rocks & Minerals (1963): 38: 591-592.
Focus on Fort Lee - A Key and Guide to the Minerals of Fort Lee (privately published).

Mineral and/or Locality  
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