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drumlin

drumlin A smooth, streamlined, oval-shaped land-form, one end of which is blunt and the other tapered. Drumlins may occur singly, but more commonly they are found within a large group, called a ‘drumlin field’ or ‘drumlin swarm’. Usually they are composed of till or boulder clay, but occasionally they are composed largely of solid rock (hence ‘rock drumlin’). They are believed to be formed beneath the outer zone of an expanding ice sheet, during a major advance: they result from the selective deposition of material that is then streamlined by the moving ice. The long axis of a drumlin lies parallel to the direction of the advance.

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"drumlin." A Dictionary of Ecology. . Encyclopedia.com. 24 Jul. 2017 <http://www.encyclopedia.com>.

"drumlin." A Dictionary of Ecology. . Encyclopedia.com. (July 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/drumlin-0

"drumlin." A Dictionary of Ecology. . Retrieved July 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/drumlin-0

drumlin

drumlin Smooth, streamlined, oval-shaped land-form, one end of which is blunt and the other tapered. Drumlins may occur singly, but more commonly they are found within a large group, called a ‘drumlin field’ or ‘drumlin swarm’. Usually they are composed of boulder clay, but occasionally they are made of solid rock (hence ‘rock drumlin’). They are believed to be formed beneath the outer zone of an expanding ice sheet, during a major advance: they result from the selective deposition of material that is then streamlined by the moving ice. The long axis of a drumlin lies parallel to the direction of the advance.

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"drumlin." A Dictionary of Earth Sciences. . Encyclopedia.com. 24 Jul. 2017 <http://www.encyclopedia.com>.

"drumlin." A Dictionary of Earth Sciences. . Encyclopedia.com. (July 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/drumlin

"drumlin." A Dictionary of Earth Sciences. . Retrieved July 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/drumlin

drumlin

drumlin (drŭm´lĬn), smooth oval hill of glacial drift, elongated in the direction of the movement of the ice that deposited it. Drumlins, which may be more than 150 ft (45 m) high and more than 1/2 mi (.8 km) long, are common in New York, Wisconsin, Canada, and Northern Ireland.

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"drumlin." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 24 Jul. 2017 <http://www.encyclopedia.com>.

"drumlin." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 24, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/drumlin

"drumlin." The Columbia Encyclopedia, 6th ed.. . Retrieved July 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/drumlin

drumlin

drum·lin / ˈdrəmlin/ • n. Geol. a low oval mound or small hill, typically one of a group, consisting of compacted boulder clay molded by past glacial action.

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"drumlin." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 24 Jul. 2017 <http://www.encyclopedia.com>.

"drumlin." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (July 24, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/drumlin

"drumlin." The Oxford Pocket Dictionary of Current English. . Retrieved July 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/drumlin