Wind gap

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Stream capture by headward erosion, leaving a wind gap Stream capture.png
Stream capture by headward erosion, leaving a wind gap

A wind gap (or air gap) [1] is a gap through which a waterway once flowed that is now dry as a result of stream capture. [2] A water gap is a similar feature, but one in which a waterway still flows. Water gaps and wind gaps often provide routes which, due to their gently inclined profile, are suitable for trails, roads, and railroads through mountainous terrain.

Examples of wind gaps in the Blue Ridge Mountains of Virginia include Swift Run Gap, Rockfish Gap, and Buford's Gap. The last was the original crossing of the Blue Ridge Mountains near Bedford for the Virginia and Tennessee Railroad, later the Norfolk and Western Railway, a precursor of today's Norfolk Southern Railway system. Another wind gap with substantial importance in U.S. history is the Cumberland Gap near the junction of Kentucky, Virginia, and Tennessee.

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Blue Ridge Tunnel Historic railroad tunnel

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Rockfish Gap

Rockfish Gap is a wind gap located in the Blue Ridge Mountains between Charlottesville and Waynesboro, Virginia, United States, through Afton Mountain, which is frequently used to refer to the gap.

Swift Run Gap is a wind gap in the Blue Ridge Mountains located in the U.S. state of Virginia.

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Buford's Gap is a wind gap in the Blue Ridge Mountains in Bedford County, Virginia. Buford's Gap was the original crossing of the Blue Ridge Mountains for the Virginia and Tennessee Railroad, later the Norfolk and Western Railway, a precursor of today's Norfolk Southern Railway system. It was the site of a battle in 1864 during the American Civil War. U.S. Route 460 also passes through the gap.

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Greenwood Tunnel

The Greenwood Tunnel is a historic railroad tunnel constructed in 1853 by Claudius Crozet during the construction of the Blue Ridge Railroad. The tunnel was the easternmost tunnel in a series of four tunnels used to cross the Blue Ridge Mountains of Virginia. Located near Greenwood in Albemarle County, Virginia, the tunnel was used by the Chesapeake and Ohio Railway (C&O) until its abandonment in 1944. The tunnel still exists, though sealed, next to the old C&O line, now owned by CSX Transportation and leased to the Buckingham Branch Railroad, which runs through a cut bypassing the old tunnel.

Pisgah Mountain

Pisgah Mountain or Pisgah Ridge is a ridgeline running 12.5 miles (20.1 km) from Tamaqua to Jim Thorpe, Pennsylvania. It is oriented north-northeast to south-southwest, and its north-side valley is followed by U.S. Route 209 from river gap to river gap. The ridge is a succession of peaks exceeding 1,440 feet (438.9 m) rising 300 to 540 feet above the boroughs of Lansford, Coaldale, and Tamaqua in the Panther Creek valley. The highest point on Pisgah Mountain is at 1,611 feet (491 m) in the borough of Summit Hill, which sits atop the ridge. Near Summit Hill was the "Sharpe Mountain" (peak) where in 1791 Phillip Ginter is documented as having discovered anthracite, leading to the formation of the Lehigh Coal Mine Company. In 1818 the Lehigh Coal Company took over the mines, and the mining camp gradually became a settlement and grew into Summit Hill.

Gaps of the Allegheny

The gaps of the Allegheny, meaning gaps in the Allegheny Ridge in west-central Pennsylvania, is a series of escarpment eroding water gaps along the saddle between two higher barrier ridge-lines in the eastern face atop the Allegheny Ridge or Allegheny Front escarpment. The front extends south through Western Maryland and forms much of the border between Virginia and West Virginia, in part explaining the difference in cultures between those two post-Civil War states. While not totally impenetrable to daring and energetic travelers on foot, passing the front outside of the water gaps with even sure footed mules was nearly impossible without navigating terrain where climbing was necessary on slopes even burros would find extremely difficult.

References

  1. Neuendorf, Klaus K. E.; Institute, American Geological (2005). Glossary of Geology. Springer Science & Business Media. ISBN   9780922152766.
  2. Digital Atlas of Idaho - Glossary of Natural History Terms