J. Doubinger, P. Vetter, J. Langiaux, J. Galtiert, J. Broutin: La flore fossile du bassin houiller de Saint-Étienne. Mémoires du Muséum National d'Histoire Naturelle, Paris 1995, ISBN 2-85653-218-7, S. 1–355 Abstract.
stratigraphy.org
Barry C. Richards: Current Status of the International Carboniferous Time Scale. In S.G. Lucas et al. (editors) 2013: The Carboniferous-Permian Transition. New Mexico Museum of Natural History and Science Bulletin 60: 348-353. PDF
up.pt
fc.up.pt
R. H. Wagner, C. F. Winkler Prins: The Cantabrian and Barruelian stratotypes: a summary of basin development and biostratigraphic information. In: Lemos de Sousa, M.J., Wagner, R.H. (Hrsg.): Papers on the Carboniferous of the Iberian Peninsula (Sedimentology, Stratigraphy, Paleontology, Tectonics and Geochemistry). Anais da Facultade de Ciencias, Supplement, 64(Sp. Vol.), Universidade do Porto, 1985, S. 359–410 online
