shale : Idioms & Phrases
Bituminous shale
- an argillaceous shale impregnated with bitumen, often accompanying coal.
Webster 1913
humic shale
-
noun shale that is rich in humic acids
WordNet
oil shale
-
noun shale from which oil can be obtained by heating
WordNet
shale oil
-
noun oil extracted from oil shale by heating
