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Wiley InterScience | |||||||||
  BoreasVolume 36 Issue 2, Pages 143 - 147 Published Online: 28 Jun 2008 Journal compilation © 2009 The Boreas Collegium
Abstract | References | Full Text: PDF (Size: 331K) | Related Articles | Citation Tracking  Supporting evidence from the New York drumlin field that elongate subglacial bedforms indicate fast ice flow Copyright 2007 Collegium Boreas ABSTRACTAlthough drumlins and other subglacial bedforms are well-studied features, controls on their formation and morphometry have remained elusive. Of current interest is the hypothesis that elongate bedforms (length:width ratios≥ 10) indicate fast ice flow, and perhaps the location of past ice streams. This hypothesis is explored by analysing drumlins from the New York State drumlin field. A subset of 548 drumlins between Oneida Lake and Lake Ontario was digitized using 10-m grid cell digital elevation data. Because bedform elongation is greatest along the axis of a reconstructed lobe and increases down flowline, elongate bedforms are best explained by fast ice flow. The swath of elongate bedforms between lakes Ontario and Oneida, the boundaries of which do not coincide with topography, may signify the location of an ice stream during deglaciation. received 20th February 2006, accepted 12th June 2006 | 
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