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

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World English Dictionary
oil shale
 
n
a fine-grained shale containing oil, which can be extracted by heating

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
oil shale  
A fine-grained black or dark brown shale containing hydrocarbons in the form of kerogen. When heated, oil shale yields petroleum or natural gas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Oil shale extraction is similarly difficult and energy-intensive.
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