till
**Definition:** The unsorted mixture of clay, silt, sand, gravel, and boulders deposited directly by a glacier — dropped in place as the ice melts, without the sorting that water would provide. Till is the glacier's residue: everything it picked up, ground down, and carried along, dumped in a jumble when the ice retreated. The soil of much of the American Midwest is glacial till.
The unsorted mixture of clay, silt, sand, gravel, and boulders deposited directly by a glacier — dropped in place as the ice melts, without the sorting that water would provide. Till is the glacier's residue: everything it picked up, ground down, and carried along, dumped in a jumble when the ice retreated. The soil of much of the American Midwest is glacial till.
Etymology
Origin uncertain — possibly from an older Scots or northern English word for stiff, unyielding ground. The glacial sense dates to the 19th century.
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