Functional groups and common pyrolysate products of Odontopteris cantabrica (index fossil for the Cantabrian Substage, Carboniferous)

► Uncommon-common preservations of Odontopteris cantabrica: Canada-Czech Republic ► Plant-fossil index to Cantabrian Substage, 306 Ma, coal age of the world ► First-time spectrochemistry: FTIR and Py-GC/MS (34-350 amu) ► Little chemical difference due to preservations ► Spectrochemical-taxonomic parameters