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Sullivan Quarry (Armetta Quarry; Copar Quarry; Westerly Granite Co. Quarry), Bradford, Westerly, Washington Co., Rhode Island, USA

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Latitude & Longitude (WGS84): 41° 23' 7'' North , 71° 44' 7'' West
Latitude & Longitude (decimal): 41.38528,-71.73528
Köppen climate type:Cfb : Temperate oceanic climate

A quarry on 900 plus acres and 200 feet deep. Known as the John B. Sullivan quarry when it opened in the early 20th century; the Sullivan Granite Company was organized in 1921. Last operated for dimension stone by the Westerly Granite Company in 1969. Since 2010, the quarry has been leased to and operated by Armetta, LLC (formerly Copar) for crushed stone, though still owned by Westerly Granite Co.

Mineral List

16 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

Roadian - Kungurian
268.8 - 279.3 Ma

ID: 2798453
Narragansett Pier Plutonic Suite - fine-grained granite

Age: Permian (268.8 - 279.3 Ma)

Stratigraphic Name: Narragansett Pier Plutonic Suite

Description: Gray to pink, fine-grained equigranular, massive to faintly foliated granite composed of microcline, oligoclase, quartz, biotite, magnetite, zircon, monazite, allanite, and apatite; secondary chlorite, muscovite, calcite. Occurs mainly as elongate (up to 2.5 km) dikes, up to 80 m wide. Mapped formerly as Westerly Granite.

Comments: Printed map unit symbol is Pnfg, digital map uses Pngf. Part of Avalon Terrane Narragansett Pier Plutonic Suite - intrudes both Hope Valley and Esmond-Dedham subterranes (e.g., stitching pluton). Contains abundant veins of pegmatite too small to be mapped individually. Radiometric ages of 276 Ma by Kocis and others (1978), 272+/-4 Ma by Hermes and others (1981), and 273+/-2 Ma by Zartman and Hermes (1987) are consistently Early Permian. Structural studies by Mosher (1983) and Reck and Mosther (1988) indicate that intrusion began during the third period of deformation in the Narragansett Basin. Argon release patterns (Dallmeyer, 1982) indicate that the granite and intruded sediments had cooled below argon retention temperatures of hornblende by the Late Permian and of biotite by the Early Triassic. Intruded by the Westerly Granite, which has been radiometrically dated at 276+/-7 Ma. The two granites are probably genetically related based on similarities in age, mineralogy, and geochemistry (Hozik, 1992) per RI003. Per printed map: age of rock based on radiometric data from RI008

Lithology: Major:{granite}

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

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.


Winslow, Willard Stone, Jr. (1945) Some notes on mineral localities in Rhode Island, Rocks & Minerals: 20: 466.

Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, ed., University of Rhode Island, Kingston, Rhode Island.

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