|Latitude & Longitude (WGS84):||43° 45' 34'' North , 71° 49' 38'' West|
|Latitude & Longitude (decimal):||43.75972,-71.82750|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
A former open pit mica and feldspar mine.
Mineralization is granite pegmatite, Grafton field. Located near the village of North Groton. (Has produced remarkable examples of hydroxylherderite, strengite, phosphosiderite, strunzite and other pegmatite phosphates.)
Local rocks include rocks of the Littleton Formation, Upper unnamed member.
PLEASE TAKE NOTICE: The Fletcher Mine has been closed to the public since the 1970s. The property is posted against tresspassers. Prosecution will be the result of trespassing. Adjoining property with mines is also privately owned. Please respect wishes of property owners concerned with your safety in mind.
40 valid minerals. 1 (TL) - type locality of valid minerals. 4 erroneous literature entries.
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
|Devonian - Silurian|
358.9 - 443.8 Ma
|Paleozoic intrusive rocks|
Age: Paleozoic (358.9 - 443.8 Ma)
Lithology: Intrusive igneous rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
393.3 - 419.2 Ma
|Littleton Formation, Upper unnamed member|
Age: Early Devonian (393.3 - 419.2 Ma)
Stratigraphic Name: Littleton Formation
Description: Light-gray metaturbidite, lithologically identical to, and probably correlative with, the Seboomook Formation of Maine. Coticule layers common.
Comments: Part of the Central Maine Composite Terrane (Central Maine Trough) - Variably metamorphosed sedimentary and volcanic rocks of greenschist to granulite facies, locally migmatized. Area includes structural belts between the Monroe fault on the west and the Campbell Hill fault on the east; that is, the Bronson Hill anticlinorium, Piedmont allochthon, Kearsarge-central Maine synclinorium, central New Hampshire anticlinorium, and Rochester-Lebanon (Maine) antiformal synclinorium.
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.