Cliff-top dune: Difference between revisions
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* a dune advances up a pre-existing slope, which is then eroded to form a cliff; |
* a dune advances up a pre-existing slope, which is then eroded to form a cliff; |
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* a dune forms during a period of high sea level, then sea level drops, exposing a cliff face. |
* a dune forms during a period of high sea level, then sea level drops, exposing a cliff face. |
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They are most often seen as coastal landforms, but can also occur along lakes and rivers, and in deserts. Places where they are relatively common include the west coat of [[Jutland]], [[Denmark]]. |
They are most often seen as coastal landforms, but can also occur along lakes and rivers, and in deserts. Places where they are relatively common include the west coat of [[Jutland]], [[Denmark]]. They can also be found in certain places along the shores of the [[Great Lakes]] in [[Michigan]], including the Grand Sable Dunes in [[Pictured Rocks National Lake Shore]] and in the [[Sleeping Bear Dunes National Lake Shore]], most dramatically on [[South Manitou Island]]. |
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==References== |
==References== |
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Revision as of 16:06, 25 March 2009
Cliff-top dunes, also known as perched dunes, are dunes that occur on the tops of cliffs. They are uncommon in most parts of the world, because they only develop under unusual geomorphological conditions. Processes by which they may be formed include:
- a dune advances up a pre-existing slope, which is then eroded to form a cliff;
- a dune forms during a period of high sea level, then sea level drops, exposing a cliff face.
They are most often seen as coastal landforms, but can also occur along lakes and rivers, and in deserts. Places where they are relatively common include the west coat of Jutland, Denmark. They can also be found in certain places along the shores of the Great Lakes in Michigan, including the Grand Sable Dunes in Pictured Rocks National Lake Shore and in the Sleeping Bear Dunes National Lake Shore, most dramatically on South Manitou Island.
References
- Saye, Samantha E., Kenneth Pye and Lars B. Clemmensen (2006). "Development of a cliff-top dune indicated by particle size and geochemical characteristics: Rubjerg Knude, Denmark". Sedimentology. 53: 1–21. doi:10.1111/j.1365-3091.2005.00749.x.
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