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During the early part of the Serpukhovian stage of the Mississippian period, Carboniferous era around 330 Million years, a mass extinction occurred that wiped out between 13-39% of marine genera. Stanley, S. M. (2016, October 3). Estimates of the magnitudes of major marine mass extinctions in earth history. pnas.org. Retrieved December 30, 2022, from https://www.pnas.org/doi/10.1073/pnas.1613094113 McGhee, G. R., Sheehan, P. M., Bottjer, D. J., & Droser, M. L. (2012, February 1). Ecological ranking of Phanerozoic biodiversity crises: The Serpukhovian (early Carboniferous) crisis had a greater ecological impact than the end-Ordovician. Geology. Retrieved December 30, 2022, from https://pubs.geoscienceworld.org/gsa/geology/article-abstract/40/2/147/130800/Ecological-ranking-of-Phanerozoic-biodiversity?redirectedFrom=fulltext Its causes are still currently unknown and most marine genera groups recovered in the Pennsylvanian period. But I'm curious about the impacts this extinction event had on the diversity on Ctenacanthiformes and other Chondricthyian groups from the time and their subsequent recovery? What do you guys think? @Elasmohunter @Fossildude19 @deutscheben What do you think?