CARBONIZATION • FREE TRANSLATOR.ORG • Definition of Carbonization

... one and the same slice, every transition can be observed from this structure to that which has been described as characteristic of ordinary coal. The latter appears to rise out of the former, by the breaking-up and increasing carbonization of the larger and the smaller sacs. And, in the anthracitic coals, this process appears to have gone to such a length, as to destroy the original structure altogether, and to replace it ...

— Discourses - Biological and Geological Essays • Thomas H. Huxley