Till: Difference between revisions
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''This article is about glacial till. For the German name see: [[Till Eulenspiegel]]. For another usage, see [[Cash register]]'' |
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[[image:Glacial_till_exposed_in_roadcut-750px.jpg|thumb|right|Glacial till with tufts of grass]] |
[[image:Glacial_till_exposed_in_roadcut-750px.jpg|thumb|right|Glacial till with tufts of grass]] |
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Glacial drift is a general term for the coarsely graded and extremely heterogeneous [[sediment]]s of [[glacier|glacial]] origin. Glacial '''till''' is that part of glacial drift which was deposited directly by the glacier. It may vary from [[clay]]s to mixtures of clay, [[sand]], [[gravel]] and [[boulder]]s. A particularly sticky form of clay till is called [[gumbo]]. Clay in till may form balls called till balls. If a till ball rolls around in a stream and picks up rocks from the bed of the stream and becomes covered with them it may become an armored till ball. |
Glacial drift is a general term for the coarsely graded and extremely heterogeneous [[sediment]]s of [[glacier|glacial]] origin. Glacial '''till''' is that part of glacial drift which was deposited directly by the glacier. It may vary from [[clay]]s to mixtures of clay, [[sand]], [[gravel]] and [[boulder]]s. A particularly sticky form of clay till is called [[gumbo]]. Clay in till may form balls called till balls. If a till ball rolls around in a stream and picks up rocks from the bed of the stream and becomes covered with them it may become an armored till ball. |
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Till is deposited at the [[moraine|terminal moraine]] and along the [[moraine|lateral moraines]] of a glacier. As a glacier melts, especially a [[continental glacier]] large amounts of till are |
Till is deposited at the [[moraine|terminal moraine]] and along the [[moraine|lateral moraines]] of a glacier. As a glacier melts, especially a [[continental glacier]] large amounts of till are deposited by the [[river|rivers]] flowing from the glacier and in any [[proglacial lake]]s which may form. Till may contain [[alluvial deposit]]s of [[gem]]s or other valuable [[ore]] minerals picked up by the glacier during its advance, for example the [[diamond|diamonds]] found in [[Wisconsin]], [[Indiana]], and [[Canada]]. |
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'''Till''' is also a first name in the [[German language]], related to the medieval name ''Theoderich'' (via ''Dietrich'', for which ''Tillmann'' is as diminuitiv and/or regional form -- which then sometimes is shortened to ''Till''), and in the [[Friesian language]], as a short form of medieval names beginning with ''Uiet-''. See: [[Till Eulenspiegel]]. [http://www.7brg.de/Vornamen/mvort.htm] |
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A '''Till''' is another name for a [[Cash register]]. |
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[[Category:Glaciology]] |
[[Category:Glaciology]] |
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[[Category:Sedimentary rocks]] |
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Revision as of 16:57, 5 December 2004
This article is about glacial till. For the German name see: Till Eulenspiegel. For another usage, see Cash register
Glacial drift is a general term for the coarsely graded and extremely heterogeneous sediments of glacial origin. Glacial till is that part of glacial drift which was deposited directly by the glacier. It may vary from clays to mixtures of clay, sand, gravel and boulders. A particularly sticky form of clay till is called gumbo. Clay in till may form balls called till balls. If a till ball rolls around in a stream and picks up rocks from the bed of the stream and becomes covered with them it may become an armored till ball.
Till is deposited at the terminal moraine and along the lateral moraines of a glacier. As a glacier melts, especially a continental glacier large amounts of till are deposited by the rivers flowing from the glacier and in any proglacial lakes which may form. Till may contain alluvial deposits of gems or other valuable ore minerals picked up by the glacier during its advance, for example the diamonds found in Wisconsin, Indiana, and Canada.
In cases where the till has been cemented together into solid rock, it is known as tillite.