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till |
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till: see drift drift, deposit of mixed clay, gravel, sand, and boulders transported and laid down by glaciers. Stratified, or glaciofluvial, drift is carried by waters flowing from the melting ice of a glacier. ..... Click the link for more information. . tillIn geology, the unsorted material deposited directly by glacial ice and showing no stratification. Till is sometimes called boulder clay because it is composed of clay, boulders of intermediate size, or both. The rock fragments are usually angular and sharp rather than rounded, because they are deposited from ice and have undergone little water transport. The pebbles and boulders may be faceted and striated from grinding while lodged in the glacier. till1 a box, case, or drawer into which the money taken from customers is put, now usually part of a cash register till2 an unstratified glacial deposit consisting of rock fragments of various sizes. The most common is boulder clay |
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| This was seen as a classic Permo-Carboniferous glacial deposit (it met 14 out of 15 criteria for being glacial as identified by Sayles, 1914, 1919) but Wegener's reconstruction of Pangea placed the Boston area near the equator. We were able to really work out the anatomy of this particular glacial deposit," says Philip A. His long-term study of glacial deposits supports other contentions that thousands of years ago Earth experienced much wider average temperature swings than previously thought. |
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