"Black shale" refers to a type of sedimentary rock that is dark in color and has a high content of organic material.
Full definition
Synonyms for individual words can be found below.
«black»
«shale»
Sentences with «black shale»
- Precipitation peaked when the orbit was at its most eccentric, producing deep lakes that left layers of black shale in eastern North America. (ldeo.columbia.edu)
- In Western Australia, they found preliminary evidence of these oxygen whiffs in black shales deposited on the seafloor of an ancient ocean. (sciencedaily.com)
- Interspersed in the red stone were narrow bands of black shale containing petrified fish, from a time when a deep lake covered the area. (discovermagazine.com)
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