From Wikipedia, the free encyclopedia
| Blue Ridge Mountains |
| Range |
|
|
| Country |
United States |
| States |
Georgia, North Carolina, Tennessee, Virginia, Maryland, Pennsylvania, South Carolina, West Virginia |
|
| Part of |
Appalachian Mountains |
|
| Highest point |
Mount Mitchell |
| - elevation |
6,684 ft (2,037 m) |
| - coordinates |
35°45′53″N 82°15′55″W / 35.76472°N 82.26528°W / 35.76472; -82.26528 |
|
| Geology |
granite, gneiss, limestone |
| Orogeny |
Grenville orogeny |
|
|
|
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 along the Appalachian Trail.[4]
[edit] 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 (1,830 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 (750 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.
[edit] 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.
[edit] History
The English who settled 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. As more settlers moved into Virginia, their economic and at times martial competition pushed the native inhabitants west.[7]
[edit] Flora and fauna
[edit] Musical references
- The celebrated 1971 John Denver song "Take Me Home, Country Roads".
- 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"[8]
- 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)
[edit] See also
[edit] References
- ^ "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.
- ^ 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
- ^ "Blue Ridge Parkway, Frequently Asked Questions". National Park Service. 2007. http://www.nps.gov/blri/faqs.htm. Retrieved 2007-12-29.
- ^ 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.
- ^ 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.
- ^ 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
- ^ "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.
- ^ "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.
[edit] External links
