Sullivan Quarry (Armetta Quarry; Copar Quarry; Westerly Granite Co. Quarry), Bradford, Westerly, Washington Co., Rhode Island, USA
|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.
16 valid minerals.
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
|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
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. 
Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, ed., University of Rhode Island, Kingston, Rhode Island.