Charcoalified

2015, Howard G. Falcon-Lang, Francine Kurzawe, Spencer G. Lucas, Walchian Charcoalified Wood from the Early Community Pit Formation in Prehistoric Trackways National Monument, New Mexico, Spencer G. Lucas, William A. DiMichele (editors), Carboniferous-Permian Transition in the Robledo Mountains, Southern New Mexico, Bulletin 65, New Mexico Museum of Natural History and Science, page 116, The charcoalified fossil wood in the lowermost part of the channel-fill accumulated at, or shortly after, sea-level lowstand.

Source: wiktionary

2017, A.T. Brasier, et al., Earliest Cretaceous cocoons or plant seed structures from the Wealden Group, Hastings UK, A. T. Brasier, D. McIlroy, N. McLoughlin (editors), Earth System Evolution and Early Life, Geological Society of London, Special Publication 448, page 401, These objects were found within the Fairlight Clay, associated with fossil charcoalified wood.

Source: wiktionary

Many early fossil flowers and fruits are preserved as charcoalified materials (Friis et al. 2010, 2011).

Source: wiktionary