The Hangenberg event, also known as the Hangenberg crisis or end-Devonian extinction, is a mass extinction that occurred at the end of the Famennian stage, the last stage in the Devonian Period (roughly 358.9 ± 0.4 million years ago).[1][2] It is usually considered the second-largest extinction in the Devonian Period, having occurred approximately 13 million years after the Late Devonian mass extinction (Kellwasser event) at the Frasnian-Famennian boundary. The event is named after the Hangenberg Shale, which is part of a sequence that straddles the Devonian-Carboniferous boundary in the Rhenish Massif of Germany.[3]
^Becker, Ralph Thomas; Kaiser, Sandra Isabella; Aretz, Markus (2016). "Review of chrono-, litho- and biostratigraphy across the global Hangenberg Crisis and Devonian–Carboniferous Boundary". Geological Society, London, Special Publications. 423 (1): 355–386. Bibcode:2016GSLSP.423..355B. doi:10.1144/SP423.10. ISSN0305-8719. S2CID131491081.