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till |
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tillDeposit of clay, mud, gravel, and boulders left by a glacier. It is unsorted, with all sizes of fragments mixed up together, and shows no stratification; that is, it does not form clear layers or beds. 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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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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