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According to Leser, it is also called a sill (geology), and is a gently arched landform of various orders of size in topographic, sub-glacial or sub-hydric geology.It may be as small as a rock formation in a river or may assume continental scale.
- Whittow, John (1984). Dictionary of Physical Geography. London: Penguin, 1984, p. 525. ISBN 0-14-051094-X.
- Leser, Hartmut (ed.). Wörterbuch Allgemeine Geographie, Munich: dtv, 2005, p. 822.
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