Blue Ridge Mountains

The Blue Ridge, or Blue Ridge Mountains, is a physiographic province of the larger Appalachian Mountains range. This province consists of northern and southern physiographic regions, which divide near the Roanoke River gap.^[1] The mountain range is located in the eastern United States, starting at its southern-most portion in Georgia, then ending northward in Pennsylvania. 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 noted for their bluish color when seen from a distance. Trees put the "blue" in Blue Ridge, from the isoprene released into the atmosphere,^[2] thereby contributing to the characteristic haze on the mountains and their distinctive color.^[3]

Within the Blue Ridge province are two major national parks: the Shenandoah National Park in the northern section and the Great Smoky Mountains National Park in the southern section. The Blue Ridge also contains the Blue Ridge Parkway, a 469-mile (755 km) long scenic highway that connects the two parks and is located along the ridge crestlines with the Appalachian Trail.^[4]

Geography

See also: List of mountains of the Blue Ridge

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 Brushy Mountains (a "spur" of the Blue Ridge) and other mountain ranges.

The Blue Ridge extends as far north into Pennsylvania as South Mountain. While South Mountain dwindles to mere hills between Gettysburg and Harrisburg, the band of ancient rocks that forms 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. About 125 peaks exceed 5,000 feet (1,500 m) in elevation.^[5] The highest peak in the Blue Ridge (and in the entire Appalachian chain) is Mt. 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, only New Hampshire's Mt. Washington rises above 6,000 feet (1,800 m) in the northern portion of the Appalachian chain.

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

Most of the rocks that form the Blue Ridge Mountains are ancient granitic charnockites, metamorphosed volcanic formations, and sedimentary limestones. 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 granites completed by John Aleinikoff at the U.S. Geological Survey has provided more detailed emplacement ages.

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 1,200 Ma 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 Ma preserve deformational features. Those emplaced post-1,064 Ma generally have a massive texture and missed the main episode of Mesoproterozoic compression.^[6]

The Blue Ridge Mountains began forming during the Silurian Period over 400 million years ago. Approx. 320 mya, North America and Europe collided, pushing the Blue Ridges up higher.

History

The English who settled colonial Virginia in the early 1600s recorded that the native Powhatan name for the Blue Ridge was Quirank. At the foot of the Blue Ridge, various tribes including the Sioux Manahoacs, the Iroquois, and the Shawnee hunted and fished. A German physician, John Lederer, first reached the crest of the Blue Ridge near present-day Harper's Ferry in 1669 and again the following year.

As more settlers moved into Virginia, their economic and at times martial competition pushed the native inhabitants west.^[7]

Flora and fauna

The forest environment provides natural habitat for many plants, trees and animals.

Flora

The Blue Ridge Mountains have stunted oak and oak-hickory forests and comprise most of the Appalachian slope forests. Flora also includes grass, shrubs, hemlock and mixed-oak pine forests.^[8]

Fauna

The area is host to many animals, including:^[8]

• Bird species and songbirds
• Grouse
• Wild turkey
• Wild boar
• Whitetail deer
• Many species of amphibians and reptiles
• Black bear

Musical references

• The 1971 John Denver song "Take Me Home, Country Roads".
• The bluegrass song "Blue Ridge Cabin Home" performed and recorded by many, including Flatt and Scruggs.
• John Fogerty's first solo album, released in 1973, is called The Blue Ridge Rangers, and also contains a cover of "Blue Ridge Mountains Blues".
• The song "Old Dominion" by Eddie From Ohio
• The song "Honeysuckle Blue" by Drivin N Cryin
• The song "Stonewall Jackson's Way"^[9]
• The song 'Baltimore' by the Virginia based band The Hackensaw Boys features the line "the Blue Ridge Mountains calling me back home".
• Been All Around This World - The Grateful Dead. "Up On The Blue Ridge Mountains, there I'll make my stand."
• The song "Blue Ridge Mountain Sky" by The Marshall Tucker Band.
• The song "Blue Ridge" by Annuals.
• The song "Blue Ridge" by Bob Artis, often performed by The Seldom Scene.
• The song "Blue Ridge Mountain Blues" by Earl Scruggs.
• The song "Blue Ridge Mountains" by Fleet Foxes contains the lyrics "...I heard that you missed your connecting flight, to the Blue Ridge Mountains over near Tennessee"
• The band piece "Blue Ridge Saga" by James Swearingen.
• Kristin Hersh's "Houdini Blues," co-written with her father, has the lines: "I been on the other side of the Blue Ridge/Seen the Shenandoah rollin' there."
• Song and album "My Blue Ridge Mountain Boy" by Dolly Parton.
• Country-folk singer Townes van Zandt sang "My home is in the Blue Ridge Mountains" in the song "Blue Ridge Mountains"
• The song "Blue Ridge Mountains of Virginia", by NWOBHM band Tokyo Blade
• The song "Spin on a Red Brick Floor" by Nanci Griffith contains the lyrics "Oh the Blue Ridge mountains at the fall of the night; it sure feels good when you cross that line"
• The Trail of the Lonesome Pine (song)
• The song "Blue Ridge Laughing" by Carbon Leaf

See also

• Appalachian-Blue Ridge forests
• Cove (Appalachian Mountains)

References

1. ^ "Physiographic divisions of the conterminous U. S.". U.S. Geological Survey. http://water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml. Retrieved 2007-12-06.
2. ^ http://books.google.com/books?id=0X4cQus2gz8C&pg=PA261&lpg=PA261&dq=blue+mountains+chemical+terpene&source=bl&ots=63vLtifwvN&sig=KuXHhVicUbP5J34jwoLExlMBLUA&hl=en&ei=-ALLSdB_0eqVB73p_d8J&sa=X&oi=book_result&resnum=6&ct=result#PPA261,M1
3. ^ "Blue Ridge Parkway, Frequently Asked Questions". National Park Service. 2007. http://www.nps.gov/blri/faqs.htm. Retrieved 2007-12-29.
4. ^ Leighty, Dr. Robert D. (2001). "Blue Ridge Physiographic Province". Contract Report. Defense Advanced Research Projects Agency (DOD) Information Sciences Office. http://www.tec.army.mil/publications/ifsar/lafinal08_01/five/5.1.1_frame.htm. Retrieved 2007-12-29.
5. ^ Medina, M.A.; J.C. Reid, and R.H. Carpenter (2004). "Physiography of North Carolina". North Carolina Geological Survey, Division of Land Resources. http://www.geology.enr.state.nc.us/proj_earth/pdf/color_physiography_600dpi.pdf. Retrieved 2007-12-29.
6. ^ 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. http://gsa.confex.com/gsa/2004NE/finalprogram/abstract_69016.htm
7. ^ "History of Rappahannock County". Rappahannock County Administration. 2005. http://www.eoffice.com/offices/_540/675/5330/my_webserver/files/newsite/page2/page2.html. Retrieved 2007-12-29.
8. ^ ^{a b} Blue Ridge Mountains. From The New Georgia Encyclopedia]. Accessed February 2010.
9. ^ "Stonewall Jackson's Way". Poetry and Music of the War Between the States. http://www.civilwarpoetry.org/confederate/songs/tjway-song.html. Retrieved 2007-12-29.

• Olson, Ted (1998). Blue Ridge Folklife, University Press of Mississippi. ISBN 1-57806-023-0.

External links

• Blue Ridge Mountains travel guide from Wikitravel

Categories: Blue Ridge Mountains | Mountain ranges of North Carolina | Mountain ranges of Virginia | Mountain ranges of Georgia (U.S. state) | Appalachian culture | Mountain ranges of Maryland | Mountain ranges of Pennsylvania | Mountain ranges of Tennessee | Mountain ranges of South Carolina | Regions of Tennessee | Physiographic provinces