Bryozoan diversity in Southern Siberia at the Devonian–Carboniferous transition: New data confirm a resistivity to two mass extinctions

Deposition in the Kuznetsk Basin, Siberia: Insights into the Permian–Triassic transition and the Mesozoic evolution of Central Asia

“…These 4 25/05/2010 carbonates form part of a widespread Upper Devonian -Carboniferous platform across southern Central Asia (e.g. Cook et al, 1995;Gutak et al, 2008): no distinct Kuznetsk Basin was present at this time. The Carboniferous carbonates pass conformably upwards into an Upper Carboniferous -Permian non-marine clastic succession.…”

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.…”

Bryozoan Diversity Dynamics at the Devonian–Carboniferous Transition: Evidence from Transcaucasia

“…A detailed analysis of the Late Devonian bryozoan diversity dynamics was carried out in Southern Siberia [12]. The outcomes from this analysis indicate the same principal patterns as registered in Transcaucasia (Figure 3).…”

“…The present analysis pays attention to two aspects of the bryozoan diversity dynamics at the Devonian-Carboniferous transition, namely principal patterns and turnover rates. The principal patterns include total diversity (total number of taxa), number of appearances, and number of disappearances, as done in previous investigations (for instance, [12]). The three principal patterns are measured for each substage (six time slices correspond to four Famennian and two Tournaisian substages) and four taxonomic levels of bryozoans, namely species, genera, families, and orders.…”

“…The previous analyses of diversity dynamics of bryozoans revealed their resistivity to the mid-Palaeozoic mass extinctions [8,12,13], which itself is important to consider when these biotic crises are addressed (notably, bryozoans were stressed significantly by the later catastrophes [14]). However, it remains unclear whether this resistivity is a global phenomenon.…”