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Preakness Quarry (Thomas Adametz Quarry), Totowa, Passaic Co., New Jersey, USA

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Latitude & Longitude (WGS84): 40° 54' North , 74° 12' West
Latitude & Longitude (decimal): 40.90000,-74.20000
Köppen climate type:Cfa : Humid subtropical climate

A traprock quarry in Watchung Basalt.

Mineral List

1 valid mineral.

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

Early Jurassic
174.1 - 201.3 Ma

ID: 2918431
Feltville Formation

Age: Early Jurassic (174.1 - 201.3 Ma)

Stratigraphic Name: Feltville Formation

Description: (Olsen, 1980) - Interbedded brownish-red to light-grayish-red, fine- to coarse-grained sandstone, gray and black, coarse siltstone in upward-fining cycles, and silty mudstone. Fine-grained sandstone and siltstone are moderately well sorted, commonly cross-laminated, and have 15 percent or more feldspar; interbedded with brownish-red, indistinctly laminated, bioturbated calcareous mudstone. Thermally metamorphosed into hornfels where in contact with Preakness Basalt. Near the base are two thin, laterally continuous beds of black, carbonaceous limestone and gray, calcareous siltstone, each up to 3 m (10 ft) thick. These contain abundant fish, reptile, anthropod, and diagnostic plant fossils. Three or four, thin, gray to black siltstone and mudstone sequences occur in upper part of unit. Near Oakland, subrounded pebbles to cobbles of quartzite and quartz in a red siltstone and sandstone matrix (Jfc) interfinger with sandstone and siltstone of the Feltville Formation. Maximum thickness about 155 m (510 ft).

Comments: Newark Supergroup, Brunswick Group (Lyttle and Epstein, 1987). Units Jf and Jfc are described together on printed map. The units were split into separate records and appropriate descriptions for each were used.

Lithology: Major:{sandstone,siltstone}, Minor:{siltstone mudstone,mudstone}, Incidental:{limestone}

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.


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Mineral Industry of New Jersey for 1932: 10.

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