The late Silurian–Middle Devonian long-term eustatic cycle as a possible control on the global generic diversity dynamics of bivalves and gastropods

Ruban, Dmitry A.

doi:10.2478/logos-2013-0012

Cited by 2 publications

(5 citation statements)

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“…The noted absence of the dependence evaluated with the available data ( Fig. 1) and proved earlier also for some other marine fossils (Ruban, 2013) permits to formulate a working hypothesis (but nothing more than a hypothesis!) about the real unimportance of eustasy as a full biodiversity control, at least, in the Middle Palaeozoic.…”

Section: Discussionsupporting

confidence: 61%

“…The considerations presented in this paper are not valid for brachiopods only. The same problems matter for the diversity-versus-eustasy analysis of the other fossil groups (e.g., Ruban, 2013) and, probably, the entire planetary biota, as well as for the other extrinsic and intrinsic controls on the biodiversity dynamics. For instance, the prominent "greenhouse" conditions persistent during the Middle Palaeozoic (Zalasiewicz & Williams, 2012) were superimposed and/or interrupted by glacial advances and cooling episodes (Grahn & Caputo, 1992;Streel et al, 2000;Lehnert et al, 2006Lehnert et al, , 2010Diaz-Martinez & Grahn, 2007;Boucot, 2009;Elrick et al, 2009;Joachimski et al, 2009;McClung et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Some other fundamental questions (linked to data preparation techniques, data completeness, interpretations, etc. ), which have been well documented in recent palaeontological literature (e.g., Hammer & Harper, 2006;Ruban & van Loon, 2008;Benton et al, 2011;Birks et al, 2012;Wolniewicz, 2012;Irmis et al 2013;Ruban, 2013), are also not addressed below.…”

Section: Introductionmentioning

confidence: 96%

“…The possible dependence of biodiversity dynamics on global sea-level (eustatic) changes has been debated for many decades (Newell, 1967;Hallam & Wignall, 1999;Purdy, 2008;Ruban, 2010Ruban, , 2013Smith & Benson 2013). Accumulation of new palaeontological data, as well as development of new eustatic curves allow revisiting this conundrum, which also matters for particular groups of fossil organisms and particular intervals of the geologic history.…”

Section: Introductionmentioning

confidence: 99%

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Do the Available Data Permit Clarifcation of the Possible Dependence of Palaeozoic Brachiopod Generic Diversity Dynamics on Global Sea-Level Changes? A Viewpoint

Ruban¹

2014

Geologos

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At a glance, progress in palaeontology and eustatic reconstructions in the past decade permits to prove or to disprove the possible dependence of Palaeozoic brachiopod generic diversity dynamics on global sea-level changes. However, the available diversity curve is of much lower resolution than the eustatic curve. This problem can be resolved by decreasing the resolution of the latter. The other restriction linked to the chronostratigraphical incompatibility of the available data allows to focus on the Middle Palaeozoic only. A series of mass extinctions and other biotic crises in the Silurian-Devonian does not allow to interpret correctly the results of direct comparison of the brachiopod generic diversity dynamics with global sea-level changes. With the available data, it is only possible to hypothesize that the eustatic control was not playing a major part in diversity dynamics of Middle Palaeozoic brachiopods. The resolution of the stratigraphic ranges of Palaeozoic brachiopods should be increased significantly, and these ranges should be plotted against the most up-to-date geologic time scale. Until this task will be achieved, it is impossible to judge about the existence of any dependence (either full or partial) of the Palaeozoic brachiopod diversity dynamics on global sea-level changes.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Do the Available Data Permit Clarifcation of the Possible Dependence of Palaeozoic Brachiopod Generic Diversity Dynamics on Global Sea-Level Changes? A Viewpoint

Ruban¹

2014

Geologos

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“…There are several reasons which have been discussed. For instance, extraterrestrial bolide impacts (McLaren 1970), anoxia within the water column due to climate changes (House 1985;Becker and House 1994;Caplan and Bustin 1999;Bond and Wignall 2005), transgressions and regressions (Newell 1967;Hallam and Wignall 1999;Purdy 2008;Ruban 2010Ruban , 2013Smith and Benson 2013), eutrophication and increased sediment transport (Joachimski et al 1993;Schobben et al 2016), explosive volcanism and/ or large igneous provinces (LIP's, Ernst et al 2019;Racki et al 2020, among others) and much more has been considered. The main problem is that previous studies preferably have been done along former epicontinental margins between Laurassia and Gondwana.…”

Section: Significancementioning

confidence: 99%

Stratigraphy and facies of mid-Palaeozoic successions in southern Mongolia

Munkhjargal¹

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Mongolia covers a huge area in Asia and provides excellent Palaeozoic successions although large regions still lack detailed information on fauna and flora in Palaeozoic rocks. Of special interest is the Central Asian Orogenic Belt (CAOB), one of the largest collisional complexes on Earth. The CAOB is composed of a large number of terranes, continental margins, island arcs, backarc/forearc basins and accretionary wedges (Badarch et al. 2002; Safonova et al. 2017). Many terranes and regions underwent strong metamorphism, such as areas north of the Main Mongolian Lineament. To the south, Palaeozoic rocks exhibit low-grade metamorphism, thrusting and folding. Two promising long successions of Palaeozoic rocks were studied, namely the Hushoot Shiveetiin gol section and the Bayankhoshuu Ruins section. The intention of the PhD was to study marine facies settings in Palaeozoic rocks of southern and southwestern Mongolia, in an area little is known in terms of biostratigraphy and events. In order to get a better understanding on events and what might have been the driving forces I studied sections in Mongolia which have not been in the focus of research in the last decades. In order to complement studies on Late Devonian events elsewhere, I decided to study sections in open ocean environments (CAOB), far away from mainly studied epicontinental areas.As stated in many publications, events are the driving force for evolution. They exhibit dramatical changes in the palaeontological record of organisms and they are often associated with dramatic extinctions (Walliser 1996) and anoxic sediments (but not always). Mass extinctions are episodes in which a large number of plant and animal species became extinct within a few thousand to a hundred thousand years. Most events (first and second order events) are traceable worldwide. For instance, in the Late Devonian, mass extinction events recognized at the Frasnian–Famennian (F/F) stage boundary and at the Devonian–Carboniferous (D/C) boundary (McLaren and Goodfellow 1990; Sepkoski 1996; Walliser 1996). Overall, 19% of all families, 50% of all genera and at least 70% of all species became extinct (Raup and Sepkoski 1982; Sepkoski 1996; McGhee et al. 2013), but extinctions also concerned palaeoecosystems and due to Late Devonian events whole coral/stromatoporoid reef ecosystems became extinct. What might be the reason(s) for these dramatical changes? Why did the carbonate factory brake down? There are several reasons which have been discussed. For instance, extraterrestrial bolide impacts (McLaren 1970), anoxia within the water column due to climate changes (House 1985; Becker and House 1994; Caplan and Bustin 1999; Bond and Wignall 2005), transgressions and regressions (Newell 1967; Hallam and Wignall 1999; Purdy 2008; Ruban 2010, 2013; Smith and Benson 2013), eutrophication and increased sediment transport (Joachimski et al. 1993; Schobben et al. 2016), explosive volcanism (Paschall et al. 2019) and/ or large igneous provinces (LIP’s, Ernst et al. 2019; Racki et al. 2020, among others) and much more has been considered. The main problem is that previous studies preferably have been done along former epicontinental margins between Laurassia and Gondwana. Less information is available in deep open oceanic successions and shallow-water areas around island arcs. Generally, events are characterized by bituminous rocks, such as black limestones and shales within marine realms, but they do not necessarily occur everywhere (see Carmichael et al. 2016). So, the question was: “Can we recognize Palaeozoic event layers or equivalents in the CAOB?” If so, is this comparable to already published data? What might be the main trigger, as there are many reasons still in discussion? And finally, what has happened in the aftermath of those events as it seems that the CAOB may have acted as a refugium for at least some groups, such as for crinoids (Waters and Webster 2009; Tolokonnikova and Ernst 2010). In this thesis, I will provide data from isolated ecosystems from a rather unstudied region, which will complement studies from other parts of the World.

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The late Silurian–Middle Devonian long-term eustatic cycle as a possible control on the global generic diversity dynamics of bivalves and gastropods

Cited by 2 publications

References 55 publications

Do the Available Data Permit Clarifcation of the Possible Dependence of Palaeozoic Brachiopod Generic Diversity Dynamics on Global Sea-Level Changes? A Viewpoint

Do the Available Data Permit Clarifcation of the Possible Dependence of Palaeozoic Brachiopod Generic Diversity Dynamics on Global Sea-Level Changes? A Viewpoint

Stratigraphy and facies of mid-Palaeozoic successions in southern Mongolia

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