Conodont biodiversity of the Frasnian-Famennian boundary interval (Upper Devonian) in the Southern Urals

Climate instability and tipping points in the Late Devonian: Detection of the Hangenberg Event in an open oceanic island arc in the Central Asian Orogenic Belt

“…Many of these study sites have been strongly influenced by increased sedimentation from the rising Appalachian Mountains. Additional studies have been conducted in locations that would presumably not be affected by the Appalachian/Variscan Orogenic Events, but all are associated with sediments derived from the cratonic blocks of Indochina (Hara et al, 2010 andKönigshof et al, 2012), South China (Zheng et al, 1993, Chen et al, 2005, Gharaie et al, 2007, Chen et al, 2013, Komatsu et al, 2014and Whalen et al, 2015, Australia (Stephens andSumner, 2003 andGeorge et al, 2014), Russia/Siberia (Gutak et al, 2008, Izokh et al, 2009and Tagarieva, 2013 and northern Africa . In contrast, only one study has unequivocally shown the presence of a Late Devonian anoxia event in an open oceanic setting far from continental-derived sediments: Carmichael et al (2014) have documented the Kellwasser Event using multiple geochemical proxies within the Central Asian Orogenic Belt (CAOB), which therefore required an overhaul of the established models for ocean anoxia.…”

Post-Kellwasser event recovery and diversification of phacopid trilobites in the early Famennian (Late Devonian)

“…However, these taxa possibly occur in the topmost part of this zone that, devoid of Crickites and preceding the first occurrence of Cheiloceras ("post doIδ" interval ;Ziegler 1971), has now become basal Famennian. This is proven at least for latilimbatus from the Barma horizon in the SW Uralian Bol'shaya Barma section that yields conodonts from the Early and Middle triangularis Zones (Abramova & Artyushkova 2004, Tagarieva 2013. In this context, an attempt is made to update and revise both known and new post-event early Famennian phacopids, with respect to their systematic definition and their temporal occurrence within the conodont zonation (Fig.…”