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TheMarcy Group, orMarcy Massif is a subset of theGreat Range of theAdirondack Mountains, nearKeene Valley,New York,United States. It consists of theHigh Peaks nearMount Marcy[1] at the southern end of the Great Range,Allen Mountain,Cliff Mountain,Mount Colden,Gray Peak,Mount Haystack,Mount Redfield, andMount Skylight, and the lesser peaks McDonnel Mountain, North River Mountains Peak, and Rist Mountain.
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The group is unique for its formation and composition of minerals,[2] particularly for its composition ofanorthosite rock.[3] The Marcymassif includes two separate groups ofplutons, an eastern and western range. The western range is situated near theSt. Regis[4] andLong Lakequadrangles[5] and the eastern Marcy group is sited nearJay,Hurricane Mountain, and the town ofNorth Hudson.[6]
44°7′N73°55′W / 44.117°N 73.917°W /44.117; -73.917
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