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Devlin's Quarry, Garrett Rock (Garrett Mountain), Paterson, Passaic Co., New Jersey, USA

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Latitude & Longitude (WGS84): 40° 53' North , 74° 10' West
Latitude & Longitude (decimal): 40.88334,-74.16666
Köppen climate type:Cfa : Humid subtropical climate


Ref.: NJ State Geologist's Annual Rpt. (1897):80. A trap rock quarry in Watchung basalt located on the eastern face of Garrett Rock.

Mineral List

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

Late Jurassic - Early Jurassic
145 - 201.3 Ma



ID: 2738773
Passaic Formation Conglomerate and Sandstone facies

Age: Jurassic (145 - 201.3 Ma)

Stratigraphic Name: Passaic Formation

Description: Conglomeratic sandstone (JTrpsc) is brownish-red pebble conglomerate, medium- to coarse-grained, feldspathic sandstone and micaceous siltstone; unit is planar to low-angle trough cross laminated, burrowed, and contains local pebble layers. Unit forms upward-fining sequences 0.5 to 2.5 m (1.6-8 ft) thick. Conglomeratic sandstone thickness exceeds 800 m (2,625 ft).

Comments: Newark Supergroup, Brunswick Group (Lyttle and Epstein, 1987). The Passaic Formation unit description on the map encompasses multiple units (JTRp, JTRpms, JTRps, JTRpsc, JTRpcq, JTRpcl, and TRpg). The Passaic Formation was split into individual units according to the digital map and the appropriate descriptions were used for each. Names for units are from digital map.

Lithology: Major:{conglomerate sandstone}, Minor:{sandstone,siltstone}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



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