Adirondack Mountains

















Adirondack Mountains

Adirondacks in May 2008.jpg
The Adirondack Mountains from the top of Whiteface Mountain.

Highest point
PeakMount Marcy
Elevation5,344 ft (1,629 m)
Coordinates
44°06′45″N 73°55′26″W / 44.11250°N 73.92389°W / 44.11250; -73.92389Coordinates: 44°06′45″N 73°55′26″W / 44.11250°N 73.92389°W / 44.11250; -73.92389
Geography

NortheastAppalachiansMap.jpg
Map of the main mountainous regions of the northeastern United States. Strictly speaking, neither the Adirondacks nor the Catskills and Poconos are part of the Appalachian Mountains, having much different origins.

CountryUnited States
StateNew York
Geology
OrogenyGrenville Orogeny
Age of rockTonian

The Adirondack Mountains /ædɪˈrɒndæk/ form a massif in northeastern New York, United States. Its boundaries correspond to the boundaries of Adirondack Park. The mountains form a roughly circular dome, about 160 miles (260 km) in diameter and about 1 mile (1,600 m) high. The current relief owes much to glaciation.





Contents





  • 1 History


  • 2 Geology


  • 3 Ecology


  • 4 See also


  • 5 References




History




1876 map of the Adirondacks, showing many of the now obsolete names for many of the peaks, lakes, and communities.


The earliest written use of the name, spelled Rontaks, was in 1729 by the French missionary Joseph-François Lafitau. He defined it as tree eaters. In the Mohawk language, Adirondack means porcupine, an animal that may eat bark. The Mohawks had no written language at the time so Europeans have used various phonetic spellings. An English map from 1761 labels it simply Deer Hunting Country and the mountains were named Adirondacks in 1837 by Ebenezer Emmons.[1]


People first arrived in the area following the settlement of the Americas around 10,000 BC. The Algonquian peoples and the Mohawk nation used the Adirondacks for hunting and travel but did not settle. European colonisation of the area began with Samuel de Champlain visiting what is now Ticonderoga in 1609, and Jesuit missionary Isaac Jogues visited the region in 1642.[2]


In 1664 the land came under the control of the English when New Netherland was ceded to The Crown. After the American Revolutionary War, the lands passed to the people of New York State. Needing money to discharge war debts, the new government sold nearly all the original public acreage about 7 million acres for pennies an acre. Lumbermen were welcomed to the interior, with few restraints,[3] resulting in massive deforestation.


For the history of the area since industrialization, see The History of Adirondack Park.


In 1989, part of the Adirondack region was designated by UNESCO as the Champlain-Adirondack Biosphere Reserve.[4]



Geology





Whiteface Mountain is the fifth-highest mountain in the U.S. state of New York, and one of the High Peaks of the Adirondack Mountains.


The rocks of the Adirondack mountains originated about two billion years ago as 50,000 feet (15,000 m) thick sediments at the bottom of a sea located near the equator. Because of continental drift these collided with Laurentia (the precursor of modern North America) in a mountain building episode known as the Grenville orogeny. During this time the sedimentary rock was changed into metamorphic rock. It is these Proterozoic minerals and lithologies that make up the core of the massif. Minerals of interest include:



  • wollastonite, mined near Harrisville


  • magnetite and hematite, formerly mined at the Benson Mines,[5]Lyon Mountain, Mineville, Tawahus, and Witherbee.


  • graphite, mined near Hague and Ticonderoga.


  • garnet, mined at the Barton Mine, north of Gore Mountain.


  • anorthosite, visible in road cuts on the New York State Route 3 between Saranac Lake and Tupper Lake.[6]

  • marble


  • zinc: The Balmat-Edwards district on the northwest flank of the massif also in St. Lawrence County was a major zinc ore deposit


  • titanium was mined at Tawahus.

Note that even though they all resulted from the Grenville orogeny, neither the Adirondacks (now uplifted by a hot spot) nor the Catskills or Poconos (a dissected plateau formed from delta deposits) are part of the Appalachian Mountain chain (faulted and folded by continental collisions).


Around 600 million years ago, as Laurentia drifted away from Baltica (European Craton), the area began to be pulled apart forming the Iapetus Ocean. Faults developed, running north to north east which formed valleys and deep lakes. Examples visible today include the grabens Lake George and Schroon Lake. By this time the Grenville mountains had been eroded away and the area was covered by a shallow sea. Several thousand feet of sediment accumulated on the sea bed. Trilobites were the principal life-form of the sea bed, and fossil tracks can be seen in the Potsdam sandstone floor of the Paul Smiths Visitor Interpretive Center.[6]


About 10 million years ago the region began to be uplifted. It has been lifted about 7000 feet (2100 m) and is continuing at about 2 millimetres per year, which is greater than the rate of denudation. The cause of the uplift is unknown, but geologists theorize that it is caused by a hot spot in the earth's crust[6]. A recent study has revealed a column of seismically slow materials about 50-80 km deep beneath the Adirondack Mountains[7], which was interpreted to be the upwelling asthenosphere contributing to the uplift of the mountains. The occurrence of earthquake swarms near the center of the massif at Blue Mountain Lake may be evidence of this. Some of the earthquakes have exceeded 5 on the Richter magnitude scale.


Starting about 2.5 million years ago a cycle of Pleistocene glacial and interglacial periods began which covered the area in ice. During the most recent episode, the Laurentide ice sheet covered most of northern North America between about 95,000 and c. 20,000 years ago.[8] After this the climate warmed, but it took nearly 10,000 years for all of the 10,000 feet (3,000 m) thick layer of ice to melt. Evidence of this period includes:



  • Eskers: the Rainbow Lake esker bisects the eponymous lake and extends discontinuously for 85 miles. Another long discontinuous esker extends from Mountain Pond through Keese Mill, passing between Upper St. Regis Lake and the Spectacle Ponds, and continuing to Ochre, Fish, and Lydia Ponds in the St. Regis Canoe Area. A 150 foot high esker bisects the Five Ponds Wilderness Area.[9]


  • Glacial erratics: there is a large one at the Newcomb Visitor Information Centre next to the Rich Lake Trail.

  • Kames

  • Moraines

  • The cirques that characterize the Whiteface Mountain.


  • Outwash plains: St. Regis Canoe Area is an outwash plain pitted with kettle holes.

Soils in the area are generally thin, sandy, acidic, and infertile, having developed since the glacial retreat.



Ecology





Spotted turtle at the Wild Center.


The Adirondack Mountains form the southernmost part of the Eastern forest-boreal transition ecoregion.[10] They are heavily forested, and contain one of the southernmost distribution taiga in North America. The forests of the Adirondacks include spruce, pine and deciduous trees. Lumbering, once an important industry, has been much restricted by the creation of the park.[11]


The mountains include many wetlands, of which there are three kinds:[6]



  • Swamps, any wetland including trees and shrubs


  • Marshes, wetlands with water stagnation. These may support bullfrogs and spring peepers, spotted salamanders, great blue heron, American bittern, and painted turtles. Pickerel weed often forms large colonies.


  • Bogs, characterized by plants like sphagnum moss, orchids, and pitcher plants

Common birds include the boreal chickadees, gray jays, spruce grouse, black-backed woodpeckers, common loons and crossbills.


Nearly 60 percent of the park is covered with northern hardwood forest. Above 2600 feet (790 m) conditions are too poor for hardwoods to thrive, and these trees become mixed with or replaced by balsam fir and red spruce. Above 3500 feet (1000 m) black spruce replace red. Higher still only trees short enough to be covered in snow during the winter can survive.


Only a tiny fraction of the area above the tree line is classified as having an alpine climate.



See also



  • Portal-puzzle.svg Adirondack Mountains portal

  • Adirondack High Peaks


References




  1. ^ Cherniak, D. J. "Ebenezer Emmons (1799–1863)". Rensselaer Polytechnic Institute. Retrieved June 23, 2015..mw-parser-output cite.citationfont-style:inherit.mw-parser-output qquotes:"""""""'""'".mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em


  2. ^ Sulavik, Stephen B. (2007). Adirondack : of Indians and mountains, 1535–1838. Fleischmanns, N.Y.: Purple Mountain Press. pp. 21–51. ISBN 978-1930098794.


  3. ^ "History of the Adirondack Park". New York State Adirondack Park Agency. Retrieved June 23, 2015.


  4. ^ "UNESCO – MAB Biosphere Reserves Directory". www.unesco.org. Retrieved 2016-05-21.


  5. ^ Ridge, J. D. (1968). Ore Deposits of the United States, 1933–1967. New York: The American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc.


  6. ^ abcd Storey, Mike (2006). Why the Adirondacks look the way they do : a natural history (2 ed.). [S.l.]: Storey. p. 22. ISBN 0-9777172-0-8.


  7. ^ Yang, Xiaotao; Gao, Haiying (June 6, 2018). "Full‐Wave Seismic Tomography in the Northeastern United States: New Insights Into the Uplift Mechanism of the Adirondack Mountains". Geophysical Research Letters. 45: 5992–6000. doi:10.1029/2018GL078438. Retrieved 13 November 2018.


  8. ^ Dyke, A. S.; Prest, V. K. (1987). "Late Wisconsinan and Holocene History of the Laurentide Ice Sheet". Géographie physique et Quaternaire. 41 (2): 237–263.


  9. ^ Staff, Editorial. "Sea Serpents in the Adirondacks? You Bet! -". Retrieved 2015-07-30.


  10. ^ Olson; D. M.; E. Dinerstein; et al. (2001), "Terrestrial Ecoregions of the World: A New Map of Life on Earth", BioScience, 51 (11): 933–938, doi:10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2, archived from the original on 2011-10-14.


  11. ^ Wikisource Chisholm, Hugh, ed. (1911). "Adirondacks". Encyclopædia Britannica. 1 (11th ed.). Cambridge University Press. p. 193.














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