Highly oxidized or carbonized kerogen maceral group that is composed of inert, hydrogen poor organic matter with little or no petroleum generative source potential. The inertinite maceral is made up of woody tissue that has been matured by different processes. Early intense oxidation, usually involving charring, fungal attack, and/or biochemical gelification, creates the much more highly reflecting fusinite and semi-fusinite. Sclerotinite, fungal remains having a distinct morphology, are considered to be inert. An important consideration is that the inerts, as the name implies, are largely non-reactive, “dead carbon”, and they have an extremely low hydrogen index in Rock-Eval Pyrolysis.