Herbig, H.-G., Amler, M.R.W., Aretz, M. & Hartenfels, S. (Eds., 2021): 19th International Congress on the Carboniferous and Permian, Cologne 2019. Stratigraphic contributions. – Newsletters on Stratigraphy, 54 (3), 253¬404, Stuttgart (Borntraeger Science Publishers).