Marcy Group Explained

The Marcy Group, or Marcy Massif is a subset of the Great Range of the Adirondack Mountains, near Keene Valley, New York, United States. It consists of the High Peaks near Mount Marcy^[1] at the southern end of the Great Range, Allen Mountain, Cliff Mountain, Mount Colden, Gray Peak, Mount Haystack, Mount Redfield, and Mount Skylight, and the lesser peaks McDonnel Mountain, North River Mountains Peak, and Rist Mountain.

Geology

The group is unique for its formation and composition of minerals,^[2] particularly for its composition of anorthosite rock.^[3] The Marcy massif includes two separate groups of plutons, an eastern and western range. The western range is situated near the St. Regis^[4] and Long Lake quadrangles^[5] and the eastern Marcy group is sited near Jay, Hurricane Mountain, and the town of North Hudson.^[6]

External links

• PeakBagger.com - Marcy Group

Notes and References

1. Book: Hall . James . Report of the State Geologist . Frederick . James . Hamilton . Merrill . 1899 . New York (State) Geologist . 78–81 . en.
2. Web site: Syn-collisional exhumation of hot middle crust in the Adirondack Mountains (New York, USA): Implications for extensional orogenesis in the southern Grenville province U.S. Geological Survey . 2024-11-12 . www.usgs.gov . en.
3. Regan . S.P. . Walsh . G.J. . Williams . M.L. . Chiarenzelli . J.R. . Toft . M. . McAleer . R. . 2019-08-01 . Syn-collisional exhumation of hot middle crust in the Adirondack Mountains (New York, USA): Implications for extensional orogenesis in the southern Grenville province . Geosphere . en . 15 . 4 . 1240–1261 . 10.1130/GES02029.1 . 1553-040X. free . 2019Geosp..15.1240R .
4. Web site: Saint Regis, NY Quadrangle . 2024-11-12 . employees.oneonta.edu.
5. Web site: Long Lake, NY Quadrangle . 2024-11-12 . employees.oneonta.edu.
6. Seifert . Karl E. . Dymek . Robert F. . Whitney . Philip R. . Haskin . Larry A. . December 2010 . Geochemistry of massif anorthosite and associated rocks, Adirondack Mountains, New York . Geosphere . en . 6 . 6 . 855–899 . 10.1130/GES00550.1 . 2010Geosp...6..855S . 1553-040X.