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varve |
Also found in: Wikipedia, Hutchinson | 0.03 sec. |
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varve, in geology, pair of thin sedimentary layers formed annually by seasonal climatic changes. Usually found in glacial lake deposits, varves consist of a coarse-grained, light-colored summer deposit and a finer-grained, dark-colored winter deposit formed when fine sediment settles out from the water under the ice cover. Varves, and the pollen they contain, are useful for interpreting recent climatic history. 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 rhythmites display layers of varying thickness, reflecting the high spring tides and low neap tides that mark the lunar month. Until now, the oldest documented rhythmites dated to 650 million years ago and hailed from southeast Australia. |
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