Black shales

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"A thinly bedded shale that is rich in carbon, sulfide, and organic material; formed by anaerobic decay of organic matter." [1]

A dark, thinly laminated carbonaceous shale, exceptionally rich in organic matter (5% or more carbon content) and sulfide (esp. iron sulfide, usually pyrite), and more commonly containing unusual concentrations of certain trace elements (U, V, Cu, Ni). Fossil organisms (principally planktonic and nektonic forms) are commonly preserved as a graphitic or carbonaceous film or as pyrite replacements. Syn.: biopelite (...) [2]

External links

Bioshale project www.blackshale.com

References

  1. Dictionary of Science and Technology
  2. Glossary of Geology (4th ed.)
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