coalification

[koh-luh-fi-key-shuhn]
noun Geology.
the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.

Origin:
1910–15; coal + -i- + -fication

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Coalification affects not only the organic matter in coal, but the mineral
  matter as well.
Coal that has been deeply buried has undergone a higher level of coalification
  caused by high temperature and high pressure.
Methane, formed during coalification, is stored in coal seams and the
  surrounding strata and released during coal mining.
It is likely that these products are also derived from lignin, especially
  lignin that has been altered by coalification reactions.
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