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  4. Materials (hierarchy name)
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  7. combination inorganic/organic material
  8. soil
  9. [soil by composition or origin]
  10. sediment
  11. sapropel
Scope note
A nitrogen-rich, combustible, sludge-like black sedimentary deposit that occurs as a result of the decomposition of microorganisms in anaerobic conditions on the bottoms of lakes and seas. Compressed into hard rock, sapropel becomes oil shale or sapropelic coal.
Accepted term: 22-Jul-2024