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till |
Also found in: Wikipedia, Hutchinson | 0.04 sec. |
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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 How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| The Earth's oldest glacial rocks (mid-Proterozoic) were reported from Gowganda in northern Ontario (Coleman, 1907) and in 1906 Albrecht Penck introduced the term tillite for ancient lithified tills. The two permit areas are underlain by greywacke schists and supposed marine-laid tillites and In Darset has single basin of Pan-African conglomerates surrounding an anorogenic alkaline complex. 1973, Tillites and aluminous quartzites as possible time marker for middle Precambrian (Aphebian) rocks of North America, in Young, G. |
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