Brachiopod survival and recovery from the latest Ordovician mass extinctions in South China

Jiayu, Rong; Harper, David A. T.

doi:10.1002/(sici)1099-1034(199911/12)34:4<321::aid-gj809>3.0.co;2-i

Cited by 68 publications

(5 citation statements)

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“…However, the recovery of the various invertebrate groups during the subsequent early Silurian has received less attention, and it is the purpose of this paper to evaluate how one of the most abundant marine invertebrate groups, the brachiopods, reacted to the changing conditions after the peak of the glacial interval. The topic has been treated for the important South China region by Rong & Harper (1999), but this present paper discusses it in a wider context. It is in some ways complementary to the paper on Lazarus taxa across the Ordovician-Silurian boundary by , but differs fundamentally from it in (a) going back to the source papers for the brachiopod distributions (and thus ignoring the time distribution data in the Treatise on Invertebrate Paleontology); (b) in dividing the Rhuddanian occurrences into upper and lower; and (c) in confining the age range considered to the Rhuddanian, rather than extending further upwards into the Aeronian and higher parts of the Llandovery.…”

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Earliest Silurian faunal survival and recovery after the end Ordovician glaciation: evidence from the brachiopods

Cocks

Jiayu

2007

Earth and Environmental Science Transactions of the Royal Socie

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Earliest Silurian (basal Llandovery) brachiopod faunas are surveyed and listed from around the globe, and divided between Lower Rhuddanian and Upper Rhuddanian occurrences. 60 genera are known from the Lower Rhuddanian within 20 superfamilies and there are 87 genera in 25 superfamilies in the Upper Rhuddanian. The 29 areas surveyed span the globe, both latitudinally and longitudinally. Only six superfamilies are Lazarus taxa which are known both from the Ordovician and Middle Llandovery (Aeronian) and later rocks but have not been recorded from the Rhuddanian. These are surprising results, since many previous studies have inferred that the Rhuddanian was a time of very sparse faunas. The global warming that followed the latest Ordovician (Hirnantian) ice age did not proceed quickly, with an ice-cap probably present through at least the Llandovery. There is a marked absence of Lower Rhuddanian bioherms even at low palaeolatitudes; however, the ecological recovery rate was far faster than that following the end-Permian mass extinction event. The partitioning of the Rhuddanian shelf faunas into well-defined benthic assemblages progressed slowly over the interval.

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Earliest Silurian faunal survival and recovery after the end Ordovician glaciation: evidence from the brachiopods

Cocks

Jiayu

2007

Earth and Environmental Science Transactions of the Royal Socie

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“…Late Ordovician climate and related environmental and faunal changes comprise one of the clearest examples of linkages between climate changes and faunal and environmental changes within the Phanerozoic [Brenchley, 1989;Brenchley et al, 1995;Finney et al, 1997;Rong and Harper, 1999;Kump and others, 1999;Sutcliffe et al, 2000]. Because of the significance of that episode for documenting the impacts of climate and environmental changes on organisms, the Ordovician Subcommission of the International Stratigraphic Commission designated study of late Ordovician climate change as one of its projects under their GOES (Global Ordovician Earth Systems) program.…”

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confidence: 82%

Late Ordovician environmental changes in Carnic Alps and central Nevada : a comparative study

Berry

2003

Bulletin De La Société Géologique De France

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Abstract. -Correlation of the late Ordovician stratigraphic and faunal successions in the Carnic Alps, which lay in a mid-latitude site at the time, with those in Nevada, which was in the tropics at the time, reveal certain similarities. During much of the late Ordovician glacial interval, deep shelves in both areas were sites of carbonate debris flow accumulations. The debris was derived from inner or shallow shelf environments. Karst topographies developed in inner or shallow shelves in both areas during the later phase of glaciation and sea level drawdown. A quartz sand spread widely at the end of the glacial interval on deep shelf-slope environments in both areas. Perhaps coincidently, shelves in both areas were uplifted and exposed by tectonism after the late Ordovician glacial episode. Résumé. -La comparaison entre les successions stratigraphiques et les enregistrements fauniques de l'Ordovicien terminal des Alpes carniques (situés en paléolatitudes moyennes) et ceux du Nevada (en paléolatitudes tropicales) présente certaines similitudes. Durant la majorité de l'intervalle glaciaire fini-ordovicien, les deux secteurs géographiques sont représentés par des plates-formes profondes dont la sédimentation dominante était composée de « debris flow », transportés depuis des environnements de plate-forme interne ou peu profonde. La dernière phase glaciaire et la chute finale du niveau de la mer ont favorisé une intense karstification dans les domaines de plates-formes, internes ou peu profondes. Dans les environnements profonds des plates-formes, cet intervalle est caractérisé par la mise en place d'un dépôt sableux largement répandu à la faveur de ruptures de pente et de talus. Les plates-formes des deux secteurs ont peut-être subi une remontée isostatique et ont ensuite été exondés par des processus tectoniques après l'épisode glaciaire fini-ordovicien. Changements environnementaux dans les

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“…The former is characteristic of upper BA 3 (Rong & Harper 1988), whereas the latter is common in lower BA 3 occurring in Hirnantia faunas in NW England, Ireland, Morocco, Hubei and Tibet. Dysprosorthis is a new opportunistic form in the Hirnantian and, like other genera, it flourished in this crisis Patzkowsky (1995) with data from member (III) of the Bardahessiagh Formation (Candela 2003): Chord index of similarity, abundance data; samples 1 to 49 refer to Patzkowsky's (1995, table 1 and Appendix p. 179) collections; reference to these samples in Table 2. interval into the ecological vacuum left by the mid-Ashgill fauna (Rong & Harper 1999;Harper 2001).…”

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confidence: 99%

“…table 1 and Appendix p. 179) collections; reference to these samples in Table 2.interval into the ecological vacuum left by the mid-Ashgill fauna(Rong & Harper 1999;Harper 2001).…”

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Late Ordovician brachiopod faunas from Pomeroy, Northern Ireland: a palaeoenvironmental synthesis

Candela¹

2005

Transactions of the Royal Society of Edinburgh: Earth Sciences

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Comparisons of the Caradoc assemblages with North American biofacies indicate that the Bardahessiagh Formation was deposited during a transgressive regime, which peaked with the presence of a typical Sericoidea association (member (II)). These diverse and exceptionally preserved faunas lived below the storm-wave base. The assemblages also contained a shallower water brachiopod component typical of transition zone environments or above, which may have been transported during periods of instability. A deep-water regime (BAs 4 to 4–5) through the Rawtheyan occurs with the deposition of the Killey Bridge Formation, which yielded a diverse brachiopod fauna including Bimuria, Chonetoidea and Christiania. The Rawtheyan assemblage also contains a shallower water component. Representatives of the deep-water Proboscisambon assemblage occur in middle parts of the Tirnaskea Formation. This distinctive low-diversity assemblage yields small, thin-shelled brachiopods including Dedzetina, Sericoidea, Protozyga and Proboscisambon. The upper parts of the Tirnaskea Formation yielded the low diversity, shallow water (BA 3) Hirnantia fauna, which is characterised by the presence of Eostropheodonta, which is a key form of the fauna, Dysprosorthis and the absence of Hirnantia. As a whole the changing brachiopod biofacies monitor environmental fluctuations, on part of the Laurentian margin, driven mainly by eustatic and tectonic events.

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Brachiopod survival and recovery from the latest Ordovician mass extinctions in South China

Cited by 68 publications

References 28 publications

Earliest Silurian faunal survival and recovery after the end Ordovician glaciation: evidence from the brachiopods

Earliest Silurian faunal survival and recovery after the end Ordovician glaciation: evidence from the brachiopods

Late Ordovician environmental changes in Carnic Alps and central Nevada : a comparative study

Late Ordovician brachiopod faunas from Pomeroy, Northern Ireland: a palaeoenvironmental synthesis

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