Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

shale




shale
Shale. Credit: Mineral Information Institute
A common sedimentary rock produced from clay, which has a fine-grained structure in well-defined narrow strata, 0.1–0.4 mm (0.004–0.016 in.) thick, each representing a period of deposition. Shales are rich in fossils, and may contain carbonaceous matter and oil. Their metamorphism produces slate.


Related category

   • GEOLOGY AND PLANETARY SCIENCE