蛇形丘又稱蛇丘,是一种狭长弯曲的垄岗地形,因蜿蜒如蛇形,故名。蛇形丘一般两坡对称,丘脊狭窄,长度从几十米到上百公里不等,高度一般为10-30米,有时可达70米以上,其延伸方向与冰川运动方向大致相同。主要分布在大陆冰川地区。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/2/27/Esker_%28PSF%29.png/640px-Esker_%28PSF%29.png)
形成
蛇形丘的成因主要有两种:
参考
- 吴正. 现代地貌学导论 (M) 1. 北京: 科学出版社. 2009: 118. ISBN 978-7-03-025401-6.
- 杨景春 李有利. 地貌学原理 (M) 1. 北京: 北京大学出版社. 2001: 90. ISBN 7-301-09696-8.
- 冰河的堆積作用[永久失效連結]
外部链接
- Oblique aerial photo of an esker in Waterford, Maine (页面存档备份,存于互联网档案馆)
- Larry Gedney, "Eskers: The Upside-Down Riverbeds," Alaska Science Forum Article #674, August 1, 1984.
- Esker Riada Webpage (页面存档备份,存于互联网档案馆)
- Diagram illustrating (i) tunnel in glacier before retreat of ice, forming (ii) meandering esker in The Ice Melts: Deposition on page 6 of "Pennsylania and the Ice Age" published 1999 by PA DCNR Bureau of Topographic and Geologic Survey
- The Bridgenorth Esker: geomorphology and sedimentology
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