There's an excellent paper, "Burning Buried Sunshine" by Jeffrey S. Dukes (2003) which details just how much biomass goes into fossil fuel resources (coal, oil,

There's an excellent paper, "Burning Buried Sunshine" by Jeffrey S. Dukes (2003) which details just how much biomass goes into fossil fuel resources (coal, oil, and gas), and over what time periods that accumulated. Murphy doesn't cite it, though I'd run across mention of it in Vaclav Smil's books and elsewhere after discovering the paper initially on my own. <https://plus.maths.org/content/burning-buried-sunshine https://plus.maths.org/content/burning-buried-sunshine> <https://web.archive.org/web/20170207103418/https://dge.carnegiescience.edu/DGE/Dukes/Dukes_ClimChange1.pdf https://web.archive.org/web/20170207103418/https://dge.carne...> (PDF)