The Blue Ridge Mountains (Cherokee: ᏌᎪᏂᎨ ᏣᎴᎩ, Sagonige Tsalegi, "blue mountain ridge") are a physiographic province of the larger Appalachian Highlands range. The mountain range is located in the Eastern United States and extends 550 miles (885 km) southwest from southern Pennsylvania through Maryland, Virginia, North Carolina, South Carolina, Tennessee, and Georgia.[1] The province consists of northern and southern physiographic regions, which divide near the Roanoke River gap.[2] To the west of the Blue Ridge, between it and the bulk of the Appalachians, lies the Great Appalachian Valley, bordered on the west by the Ridge and Valley province of the Appalachian range.
The Blue Ridge Mountains are known for having a bluish color when seen from a distance. Trees put the "blue" in Blue Ridge, from the isoprene released into the atmosphere.[3] This contributes to the characteristic haze on the mountains and their perceived color.[4]
Within the Blue Ridge province are two major national parks: Shenandoah National Park in the northern section and Great Smoky Mountains National Park in the southern section. The Blue Ridge Parkway, a 469-mile (755 km) long scenic highway, connects the two parks and runs along the ridge crest-lines, as does the Appalachian Trail.[5] Eight national forests include George Washington and Jefferson, Cherokee, Pisgah, Nantahala and Chattahoochee.
Geography
[edit] See also: List of mountains of the Blue Ridge and Southern Sixers Blue Ridge Mountains - Front Royal, Virginia
Although the term "Blue Ridge" is sometimes applied exclusively to the eastern edge or front range of the Appalachian Mountains, the geological definition of the Blue Ridge province extends westward to the Ridge and Valley area, encompassing the Great Smoky Mountains, the Great Balsams, the Roans, the Blacks, and other mountain ranges. In North Carolina, two lower elevation ranges to the east, referred to as foothills, are also often included as "spurs" of the Blue Ridge: the Brushy Mountains and the South Mountains. In Virginia, the Southwest Mountains are an anticlinal range that similarly parallels the Blue Ridge.
The Blue Ridge Mountains as seen from Blowing Rock, North CarolinaThe Blue Ridge near Massies Mill, Nelson County, Virginia
The Blue Ridge extends as far south as Mount Oglethorpe in Georgia and as far north into Pennsylvania as South Mountain. While South Mountain dwindles to hills between Gettysburg and Harrisburg, the band of ancient rocks that form the core of the Blue Ridge continues northeast through the New Jersey and Hudson River highlands, eventually reaching the Berkshires of Massachusetts and the Green Mountains of Vermont.
The Blue Ridge contains the highest mountains in eastern North America south of Baffin Island. About 125 peaks exceed 5,000 feet (1,500 m) in elevation.[6] The highest peak in the Blue Ridge (and in the entire Appalachian chain) is Mount Mitchell in North Carolina at 6,684 feet (2,037 m). There are 39 peaks in North Carolina and Tennessee higher than 6,000 feet (1,800 m); by comparison, in the northern portion of the Appalachian chain only New Hampshire's Mount Washington rises above 6,000 feet (1,800 m). Southern Sixers is a term used by peak baggers for this group of mountains.[7]
The Blue Ridge Parkway runs 469 miles (755 km) along crests of the southern Appalachians and links two national parks: Shenandoah and Great Smoky Mountains. In many places along the parkway, there are metamorphic rocks (gneiss) with folded bands of light-and dark-colored minerals, which sometimes look like the folds and swirls in a marble cake.
Geology
[edit]Blue Ridge Mountains, viewed from Chimney Rock Mountain Overlook in Virginia
Most of the rocks that form the Blue Ridge Mountains are ancient granitic charnockites, metamorphosed volcanic formations, and sedimentary limestone. Recent studies completed by Richard Tollo, a professor and geologist at George Washington University, provide greater insight into the petrologic and geochronologic history of the Blue Ridge basement suites. Modern studies have found that the basement geology of the Blue Ridge is made of compositionally unique gneisses and granitoids, including orthopyroxene-bearing charnockites. Analysis of zircon minerals in the granite completed by John Aleinikoff at the U.S. Geological Survey has provided more detailed emplacement ages.
The northernmost extension of the Blue Ridge Mountains, in northern Maryland
Many of the features found in the Blue Ridge and documented by Tollo and others have confirmed that the rocks exhibit many similar features in other North American Grenville-age terranes. The lack of a calc-alkaline affinity and zircon ages less than 1.2 billion years old suggest that the Blue Ridge is distinct from the Adirondacks, Green Mountains, and possibly the New York–New Jersey Highlands. The petrologic and geochronologic data suggest that the Blue Ridge basement is a composite orogenic crust that was emplaced during several episodes from a crustal magma source. Field relationships further illustrate that rocks emplaced prior to 1.078–1.064 billion years ago preserve deformational features. Those emplaced post-1.064 billion years ago generally have a massive texture and missed the main episode of Mesoproterozoic compression.[8]
At the time of their emergence, the Blue Ridge were among the highest mountains in the world and reached heights comparable to the much younger Alps. Weathering, erosion, and mass wasting over hundreds of millions of years has resulted in much shorter peaks.[9]
History
[edit]The Blue Ridge Mountains, looking especially blue in the background, seen from Lynchburg, Virginia
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At the foot of the Blue Ridge, various tribes including the Siouan Manahoacs, the Iroquois, and the Shawnee hunted and fished. A German physician-explorer, John Lederer, first reached the crest of the Blue Ridge in 1669 and again the following year; he also recorded the Virginia Siouan name for the Blue Ridge (Ahkonshuck).
At the Treaty of Albany negotiated by Virginia Lieutenant Governor Alexander Spotswood with the Iroquois between 1718 and 1722, the Iroquois ceded lands they had conquered south of the Potomac River and east of the Blue Ridge to the Virginia Colony. This treaty made the Blue Ridge the new demarcation point between the areas and tribes subject to the Six Nations, and those tributaries to the colony. When colonists began to disregard this by crossing the Blue Ridge and settling in the Shenandoah Valley in the 1730s, the Iroquois began to object, finally selling their rights to the valley, on the west side of the Blue Ridge, at the Treaty of Lancaster in 1744.
Flora and fauna
[edit]View of Blue Ridge Mountains from Grandfather Mountain in North Carolina
Flora
[edit] See also: Category: Flora of the Appalachian Mountains
The Blue Ridge Mountains have stunted oak and oak-hickory forest habitats, which comprise most of the Appalachian slope forests. Flora also includes grass, shrubs, hemlock and mixed-oak pine forests.[10]
While the Blue Ridge range includes the highest summits in the eastern United States, the climate is nevertheless too warm to support an alpine zone, and thus the range lacks the tree line found at lower elevations in the northern half of the Appalachian range. Statistical modelling predicts that the alpine tree line would exist at above 7,985 feet (2434 m) in the climate zone and latitude of the southern Appalachians.[11] The highest parts of the Blue Ridge are generally vegetated in dense Southern Appalachian spruce-fir forests.[citation needed]
Fauna
[edit]
The area is host to many animals, including:
Many species of amphibians and reptiles
Ocoee salamander
A large diversity of fish species, many of which are endemic
American black bear
Songbirds and other bird species
Bobcat
Coyote
Red fox
Gray fox
Grouse
North American river otter
Whitetail deer
Wild boar
Wild turkey
Raccoon
Population centers
[edit]
The largest city located in the Blue Ridge Mountains is Roanoke, located in Southwest Virginia, while the largest Metropolitan Statistical Area is the Greenville metropolitan area in Upstate, South Carolina.[12] Other notable cities in the Blue Ridge Mountains include Charlottesville, Frederick, Hagerstown, Chambersburg, Asheville, Johnson City, and Lynchburg.
See also
[edit]
Appalachian balds
Appalachian bogs
Appalachian temperate rainforest
Appalachian-Blue Ridge forests
Cove (Appalachian Mountains)
Blue Ridge National Heritage Area
List of subranges of the Appalachian Mountains
Tennessee Frontiers: Three Regions in Transition by John R. Finger
Take Me Home, Country Roads by John Denver
References
[edit]
^"Blue Ridge". U.S. Geological Survey. Archived from the original on December 24, 2019. Retrieved December 19, 2018.
^"Physiographic divisions of the conterminous U. S." U.S. Geological Survey. Archived from the original on December 5, 2007. Retrieved December 6, 2007.
^Johnson, A. W. (1998). Invitation To Organic Chemistry. Jones & Bartlett Learning. p. 261. ISBN 978-0-7637-0432-2. blue mountains chemical terpene.
^"Blue Ridge Parkway, Frequently Asked Questions". National Park Service. 2007. Archived from the original on December 28, 2007. Retrieved December 29, 2007.
^Leighty, Dr. Robert D. (2001). "Blue Ridge Physiographic Province". Contract Report. Defense Advanced Research Projects Agency (DOD) Information Sciences Office. Archived from the original on May 21, 2008. Retrieved December 29, 2007.
^Medina, M.A.; J.C. Reid; R.H. Carpenter (2004). "Physiography of North Carolina" (PDF). North Carolina Geological Survey, Division of Land Resources. Archived (PDF) from the original on December 16, 2007. Retrieved December 29, 2007.
^"South Beyond 6000". Archived from the original on March 3, 2016. Retrieved September 19, 2016.
^Tollo, Richard P.; Aleinkoff, John N.; Borduas, Elizabeth A. (2004). "Petrology and Geochronology of Grenville-Age Magmatism, Blue Ridge Province, Northern Virginia". Northeastern Section (39th Annual) and Southeastern Section (53rd Annual) Joint Meeting. Geological Society of America. Archived from the original on October 22, 2007. Retrieved November 9, 2006.
^Davis, Donald E.; Colten, Craig E.; Nelson, Megan Kate; Saikku, Mikko; Allen, Barbara L. (2006). Southern United States: An Environmental History. ABC-CLIO. p. 261. ISBN 1-85109-780-5. Retrieved April 22, 2019.
^"Blue Ridge Mountains". The New Georgia Encyclopedia. Archived from the original on June 17, 2010. Retrieved September 4, 2016.
^Cogbill, Charles V.; White, Peter S.; Wiser, Susan K. (1997). "Predicting Treeline Elevation in the Southern Appalachians". Castanea. 62 (3): 137–146. JSTOR 4033963.
^"2020 State-based Metropolitan and Micropolitan Statistical Areas Maps". United States Census Bureau.
Further reading
[edit]
Olson, Ted (1998). Blue Ridge Folklife, University Press of Mississippi. ISBN 1-57806-023-0.
External links
[edit]
Media related to Blue Ridge Mountains at Wikimedia Commons
Blue Ridge Mountains travel guide from Wikivoyage
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Mountains of Georgia
Blue Ridge Mountains
Big Bald Mountain
Big John Dick Mountain
Black Mountain
Black Rock Mountain
Blood Mountain
Brasstown Bald
Coosa Bald
Cowrock Mountain
Currahee Mountain
Dick's Knob
Double Spring Knob
Flat Top
Fort Mountain
Glade Mountain
Glassy Mountain
Grassy Mountain
Grassy Ridge
Hightower Bald
Horsetrough Mountain
Jacks Knob
Levelland Mountain
Mount Oglethorpe
Rabun Bald
Rich Mountain
Slaughter Mountain
Springer Mountain
Tray Mountain
Wildcat Mountain
Wolfpen Ridge
Young Lick
Rich Knob
Screamer Mountain
Three Sisters
Yonah Mountain
Rock Mountain
Rocky Knob
Rocky Mountain
Ridge-and-Valley
Baugh Mountain
Blossom Hill
Horseleg Mountain
Lookout Mountain
Lumpkin Hill
Johns Mountain
Old Shorter Hill
Jackson Hill
Pigeon Mountain
Snodgrass Hill
Taylor Ridge
Turkey Mountain
White Oak Mountain
Others
Alcovy Mountain
Arabia Mountain
Bear Mountain
Blackjack Mountain
Chenocetah Mountain
Dowdell's Knob
Heggie's Rock
Kennesaw Mountain
Little Kennesaw Mountain
Mount Wilkinson
Panola Mountain
Pine Log Mountain
Pine Mountain (Bartow County)
Pine Mountain (Cobb County)
Pine Mountain Range
Sawnee Mountain
Stone Mountain
Sweat Mountain
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Mountains of Maryland
Allegheny Mountains
Backbone Mountain
Dans Mountain
Haystack Mountain
Negro Mountain
Roundtop Hill
Blue Ridge Mountains
Catoctin Mountain
Elk Ridge
Lambs Knoll
Quirauk Mountain
South Mountain
Sugarloaf Mountain
Ridge-and-Valley Appalachians
Big Savage Mountain
Breakneck Hill
Collier Mountain
Evitts Mountain
Savage Mountain
Tonoloway Ridge
Warrior Mountain
Others
Hoye-Crest
Martin Mountain Ridge
Nicholas Mountain
Polish Mountain
Town Hill
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Mountains of North Carolina
Blue Ridge Mountains
Bald Mountains
Big Bald
Max Patch
Black Mountains
Celo Knob
Mount Craig
Mount Mitchell
Brushy Mountains
Hibriten Mountain
Pores Knob
Great Balsam Mountains
Black Balsam Knob
Chestnut Mountain (Transylvania County)
Cold Mountain
Richland Balsam
Shining Rock
Tanasee Bald
Great Craggy Mountains
Beaucatcher Mountain
Great Smoky Mountains
Andrews Bald
Charlies Bunion
Kuwohi
Gregory Bald
Marks Knob
Mount Cammerer
Mount Chapman
Mount Collins
Mount Guyot
Mount Hardison
Mount Kephart
Mount Sequoyah
Mount Sterling
Old Black
Shuckstack
Silers Bald
Spence Field
Thunderhead Mountain
Tricorner Knob
Plott Balsams
Eaglenest Mountain
North Eaglenest Mountain
Waterrock Knob
Unaka Range
Big Yellow Mountain
Grassy Ridge Bald
Little Yellow Mountain
Roan Mountain
Unicoi Mountains
Bob Stratton Bald
Haw Knob
Hooper Bald
Iron Mountains
Snake Mountain
North Carolina-Tennessee-Virginia Corners
Others
Adams Mountain
Bear's Paw
Bee Mountain
Beech Mountain
Bluerock Mountain
Brier Knob
Brown Mountain
Chestnut Mountain (Caldwell County)
Crossing Knob
Doe Hill Mountain
Elk Knob
Fire Scale Mountain
Flattop Mountain
Grandfather Mountain
Grandmother Mountain
Howard Knob
Humpback Mountain
Little Chestnut Mountain
Mount Pisgah
Peak Mountain
Pixie Mountain
Rich Mountain, near Boone, Watauga County - 1) Rich Mountain (SSW of Boone) 2) Rich Mountain (NW of Boone) 3) Rich Mountain Bald (NNW of Boone)