Till

This article is about glacial sediments, for other uses see till (disambiguation).

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Till is an unsorted glacial sediment.

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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.

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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. Prospectors use trace minerals in tills as clues to follow the glacier upstream to find kimberlite diamond deposits and other types of ore deposits.

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Sediment: Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. Sedimentation is the deposition by settling of a suspended material....

Clay: :For the town in the United States, see Clay, New York....

Gravel: Gravel is rock that is of a certain size range. In geology, gravel is any loose rock that is at least two millimeters in its largest dimension (about 1/12 of an inch), and no more than 75 millimeters (about 3 inches). Sometimes gravel is restricted to rock in the 2-4 millimeter range, with pebble b...

Till related Images and Photos (experimental)

Till Human Voices Wake	Till We Meet Again	Till The Clouds Roll By (Sinatra Tribute) (DVD)	Ray LaMontagne: Till the Sun Turns Black
Ray LaMontagne: Till the Sun Turns Black	Michael Bolton: Till the End of Forever	Michael Bolton: Till the End of Forever	Hart to Hart: Till Death Do Us Hart
From Then Till Now: The Gallery of Guns	From Dusk Till Dawn 3- The Hangman's Daughter	Wait Till Your Father Gets Home: The Complete First Season (DVD)	Illustration for Till Eulenspiegel Story by Richard Strauss circa 1860-80