Villa, E. et al. 2018. Fusulines from the Central Asturian Coal? eld (Pennsylvanian, Cantabrian Zone, Spain) and their signi? cance for biostratigraphic correlation. Spanish Journal of Palaeontology. 33, 1 (Oct. 2018), 231–260. DOI:https://doi.org/10.7203/sjp.33.1.13252.