# Marcy Group

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The **Marcy Group,** or **Marcy Massif** is a subset of the [Great Range](/source/Great_Range) of the [Adirondack Mountains](/source/Adirondack_Mountains), near [Keene Valley](/source/Keene,_New_York), [New York](/source/New_York_(state)), [United States](/source/United_States). It consists of the [High Peaks](/source/Adirondack_High_Peaks) near [Mount Marcy](/source/Mount_Marcy_(New_York))[1] at the southern end of the Great Range, [Allen Mountain](/source/Allen_Mountain_(New_York)), [Cliff Mountain](/source/Cliff_Mountain_(New_York)), [Mount Colden](/source/Mount_Colden), [Gray Peak](/source/Gray_Peak_(New_York)), [Mount Haystack](/source/Mount_Haystack), [Mount Redfield](/source/Mount_Redfield), and [Mount Skylight](/source/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](/source/Anorthosite) rock.[3] The Marcy [massif](/source/Massif) includes two separate groups of [plutons](/source/Plutons), an eastern and western range. The western range is situated near the [St. Regis](/source/St._Regis,_New_York)[4] and [Long Lake](/source/Long_Lake,_New_York) [quadrangles](/source/Quadrangle_(geography))[5] and the eastern Marcy group is sited near [Jay](/source/Jay,_New_York), [Hurricane Mountain](/source/Hurricane_Mountain), and the town of [North Hudson](/source/North_Hudson,_New_York).[6]

## References

1. Hall, James; Frederick, James; Hamilton, Merrill (1899). [*Report of the State Geologist*](https://books.google.com/books?id=0nlaAAAAYAAJ&q=%22marcy%20group%22%20new%20york%20geology). New York (State) Geologist. pp. 78–81.

1. ["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"](https://www.usgs.gov/publications/syn-collisional-exhumation-hot-middle-crust-adirondack-mountains-new-york-usa). *www.usgs.gov*. Retrieved 2024-11-12.

1. 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*. **15** (4): 1240–1261. [Bibcode:2019Geosp..15.1240R](https://ui.adsabs.harvard.edu/abs/2019Geosp..15.1240R). [doi:10.1130/GES02029.1](https://doi.org/10.1130/GES02029.1). [ISSN 1553-040X](https://www.worldcat.org/issn/1553-040X)

1. ["Saint Regis, NY Quadrangle"](http://employees.oneonta.edu/baumanpr/usgs62500/Saint%20Regis.htm). *employees.oneonta.edu*. Retrieved 2024-11-12.

1. ["Long Lake, NY Quadrangle"](http://employees.oneonta.edu/baumanpr/usgs62500/Long%20Lake.htm). *employees.oneonta.edu*. Retrieved 2024-11-12.

1. 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"](http://pubs.geoscienceworld.org/geosphere/article/6/6/855/132413/Geochemistry-of-massif-anorthosite-and-associated). *Geosphere*. **6** (6): 855–899. [Bibcode:2010Geosp...6..855S](https://ui.adsabs.harvard.edu/abs/2010Geosp...6..855S). [doi:10.1130/GES00550.1](https://doi.org/10.1130/GES00550.1). [ISSN 1553-040X](https://www.worldcat.org/issn/1553-040X)

## External links

- [PeakBagger.com - Marcy Group](http://www.peakbagger.com/range.aspx?rid=150726)

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Adapted from the Wikipedia article [Marcy Group](https://en.wikipedia.org/wiki/Marcy_Group) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Marcy_Group?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.