Me and Michael Joachimski since several years are attempting to study carbon isotope ratios in terrestrial organic matter, with the final aim (1) to construct a high-resolution δ13Corg curve for the entire Devonian time, and (2) to compare/correlate this chemostratigraphic pattern with the well-studied and eventful Devonian marine isotopic record. First chaotic results are inconclusive but suggest rather large-scale changes in the terrestrial carbon record – see
https://www.researchgate.net/publication/269222406_Carbon_isotope_ratios_in_Devonian_terrestrial_organic_matter_-_call_for_samples
Therefore, we would be very grateful for a support in this still unsuccessful search for possibly WELL-DATED terrestrial organic carbon samples. Does anybody know Devonian successions, especially developed in transitional marine-continental facies, containing carbonized plant remains (or palynomorphs) of terrestrial origin?
Article Carbon isotope ratios in Devonian terrestrial organic matter...
There are upper Lower Devonian horizons rich in macroremains of plants and co-occuring spores in the Holy Cross Mts. I think about two localities: Kostomłoty (reported in SZREK, P., SALWA, S. & NIEDŹWIEDZKI, G. 2015. Plant-root system in the Lower Devonian of Poland. Estonian Journal of Earth Sciences, 64: 95-98) and Ujazd area (SZREK, P., SALWA, S., NIEDŹWIEDZKI, G., DEC, M., AHLBERG, P.E. & UCHMAN, A. 2016. A glimpse of a fish face - an exceptional fish feeding trace fossil from the Lower Devonian of the Holy Cross Mountains, Poland. Palaeogeography, Palaeoclimatology, Palaeoecology, 454: 113-124.).
Sincere thanks for all responders, and data from Poland, Argentina & Bolivia and USA. However, I am still looking for possible plant-bearing sample set from successions encompassing a long stratigraphic interval (i.e., several stages).