Grace Feldspar Mine, Newtown, Fairfield Co., Connecticut, USA
|Latitude & Longitude (WGS84):||41° 23' 59'' North , 73° 20' 30'' West|
|Latitude & Longitude (decimal):||41.39972,-73.34167|
|Köppen climate type:||Cfa : Humid subtropical climate|
Cruson (1991) gives the only known reference to this obscure locality:
Within a year of opening this last quarry, Cook had exhausted the sites here to his satisfaction and had apparently moved on. Feldspar quarrying had not died out completely, however. In September 1924, William B Warner of Newbury, NY, had again leased the mineral rights to the Young farm. He opened up a new ledge of pegmatite Cook had overlooked, and struck an unusually fine grade of feldspar. He christened his quarry the Grace Feldspar Mine and at the time there was estimated to be a sufficient quantity of high grade rock to last from five to twelve years. It is uncertain how long this operation was carried on, but Warner was in town for at least another year...
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
3 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
470 - 485.4 Ma
|Ratlum Mountain Schist|
Age: Early Ordovician (470 - 485.4 Ma)
Stratigraphic Name: Ratlum Mountain Schist
Description: Gray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, muscovite (in the schist), biotite, and garnet, also staurolite and kyanite in the schist. Numerous layers and lenses of amphibolite; also some of quartz-spessartine (coticule) and calc-silicate rock.
Comments: Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt. Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) (CT009, CT010) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (CT011) (includes Golden Hill and Ratlum Mountain Schists) (Lower? Ordovician).
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.