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oil shale

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oil shale

–noun Geology.
a black or dark-brown shale or siltstone rich in bitumens, from which shale oil is obtained by destructive distillation.

Origin:
1870–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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oil shale  
n.  A black or dark brown shale containing hydrocarbons that yield petroleum by distillation.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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