Till is an unsorted
glacial sediment. 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 in
spherical shapes called till balls. If a till ball rolls around in a stream, it may pick up rocks from the streambed and become covered by rocks; thence it is known as an armored till ball.
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Drift that is deposited directly from glacial ice and therefore not sorted. Also called till. See also glacial drift.
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