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shale |
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shaleFine-grained and finely layered sedimentary rock composed of silt and clay. It is a weak rock, splitting easily along bedding planes to form thin, even slabs (by contrast, mudstone splits into irregular flakes). Oil shale contains kerogen, a solid bituminous material that yields petroleum when heated. 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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It could do no more, for when it advanced pieces of sharp shale flew from the windows. They dipped across beds of light snow and snow-powdered shale, where they took refuge from a gale in a camp of Tibetans hurrying down tiny sheep, each laden with a bag of borax. |
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