Changes in benthic microfossil assemblages before, during and after the early Toarcian biotic crisis in the Portland-Wight Basin (Kerr McGee 97/12-1 well, offshore southern England)

Reolid, Matías; Ainsworth, N.

doi:10.1016/j.palaeo.2022.111044

Cited by 11 publications

(2 citation statements)

References 118 publications

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“…The ostracod assemblages determined for the stratigraphic interval of the Cenomanian-Turonian transition indicate the presence of a biological event corresponding to the explosion of smooth ostracods called the Cytherellid Event, also described in Spain (Barroso-Barcenilla et al, 2011), Egypt (Shahin & Elbaz, 2013a) and Algeria (Benadla et al, 2018). Cytherellids are relatively resistant to oxygen depleted conditions (Whatley, 1991(Whatley, , 1995 and Cytherella has been interpreted as an ostracod indicative of warm waters adapted to survive during low oxygen episodes (Depêche, 1984;Whatley, 1995;Bonnet et al, 1999;N'Zaba-Makaya et al, 2003;Reolid, 2020;Reolid & Ainsworth, 2022). In the Rhoundjala section the Cytherellid Event coincides with the negative carbon isotopic excursion of the OAE2 (Benadla et al, 2018).…”

Section: Interpretation and Comparison With Other Regionsmentioning

confidence: 99%

Ostrácodos del tránsito Cenomaniense-Turoniense en los Montes Ksour y Amour (Atlas Sahariano): sistemática e implicaciones paleobiogeográficas

Benadla¹,

Marok²,

Soulimane³

et al. 2023

estudgeol

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El estudio de los ostrácodos de la transición Cenomaniense-Turoniense (Cretácico superior) en los Montes Ksour y Monte Amour (Atlas Sahariano, Argelia) ha permitido la identificación de asociaciones fósiles típicas de este periodo caracterizado por cambios ambientales a escala global. La asociacion de ostrácodos consiste en 15 especies y 7 géneros, y se encuentra dominada por la familia Cytherellidae (principalmente el género Cytherella), y en menor medida por las familias Paracyprididae (exclusivamente Paracypris) y Trachyleberididae (principalmente Cythereis). Las formas menos comunes corresponden a las familias Bairdiidae, Bythocypridae y Macrocyprididae. Las asociaciones de ostrácodos del Atlas Sahariano fueron comparadas con las asociaciones de cuencas vecinas pertenecientes a la provincia paleobiogeográfica del Norte de África y Oriente Medio (margen septentrional de Gondwana) con el fin de encontrar similitudes entre cuencas. Así, el resultado obtenido muestra una gran similitud entre la fauna de ostrácodos de las cuencas del Atlas Sahariano en Argelia y Túnez. Por otro lado, existe similaridad entre las asociaciones de las cuencas de Marruecos y Egipto, y de ambas a su vez con las cuencas de Oriente Medio (Jordán y Omán). Finalmente, la fauna de la Cuenca Libanesa aparece relativamente aislada. Estas similaridades entre distintas cuencas desde el punto de vista palaeobiogeográfico pueden evidenciar cierta comunicación entre las mismas o condiciones ambientales equivalentes durante el tránsito Cenomaniense-Turoniense.

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Section: Interpretation and Comparison With Other Regionsmentioning

confidence: 99%

Ostrácodos del tránsito Cenomaniense-Turoniense en los Montes Ksour y Amour (Atlas Sahariano): sistemática e implicaciones paleobiogeográficas

Benadla¹,

Marok²,

Soulimane³

et al. 2023

estudgeol

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“…Other processes documented during the Jenkyns Event include: (1) a perturbation of the carbon cycle evidenced as a negative carbon isotopic excursion (CIE; e.g., Jenkyns & Clayton, 1986;Kemp et al, 2005;Hesselbo et al, 2007;Ruebsam et al, 2019Ruebsam et al, , 2020a; (2) oxygen depleted conditions in some marine basins, the Toarcian Oceanic Anoxic Event (T-OAE, Gill et al, 2011;Fonseca et al, 2018;Izumi et al, 2018;Ruebsam et al, 2018;Suan et al, 2018); (3) a sea-level rise (e.g., Hallam, 1981;Pittet et al, 2014;Haq, 2018;Krencker et al, 2019); and (4) a crisis of marine carbonate productivity (Bucefalo-Palliani et al, 2002;Mattioli et al, 2004) and acidification (Müller et al, 2020;Ettinger et al, 2021). In the context of environmental change, the early Toarcian is also characterized by a second-order extinction that affected marine ecosystems, including dynoflagellate cysts, foraminifera, ostracods, brachiopods, corals, bivalves, and cephalopods (e.g., Hallam, 1987;Little & Benton, 1995;Harries & Little, 1999;Aberhan & Fürsich, 2000;Macchioni & Cecca, 2002;Vörös, 2002;Arias, 2009Arias, , 2013Dera et al, 2010;García Joral et al, 2011;Caruthers et al, 2014;Baeza-Carratalá et al, 2017;Reolid et al, 2019;Vasseur et al, 2021;Reolid & Ainsworth, 2022). In addition to the extinction, the biotic crisis is also expressed in a decrease of diversity, mainly affecting benthic communities, as well reductions in body siz...…”

Section: Introductionmentioning

confidence: 99%

Dinosaur extinctions related to the Jenkyns Event (early Toarcian, Jurassic)

Reolid

Ruebsam²,

Benton

2022

Spanish J. Palaeontol.

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The early Toarcian Jenkyns Event (~183 Ma) was characterized by a perturbation of the global carbon cycle, global warming, which at continental areas led to intensifi ed chemical weathering, enhanced soils erosion, and intensifi ed wildfi res. Warming and acid rain aff ected diversity and composition of land plant assemblages, caused a loss of forests and thereby impacted on trophic webs. The Jenkyns Event, triggered by volcanic activity of the Karoo-Ferrar Large Igneous Province, changed terrestrial ecosystems, and also aff ected the dinosaurs. Fossil macroplant assemblages and palynological data reveal reductions in the diversity and richness of plant communities. A substantial loss of land plant biomass and a shift to forests dominated by Cheiropelidiaceae conifers occurred as a consequence of seasonally dry and warm conditions. Major changes occurred to hervivore dinosaurs, with extinction of diverse basal families of Sauropodomorpha ('prosauropods') as well as some basal sauropods. Ornithischian dinosaurs show patchy records; some heterodontosaurids disappeared and the scelidosaurids (Thyreophora) went extinct during the Jenkyns Event. The dominant carnivorous dinosaurs, the Coelophysoidea (Theropoda), died out during the Jenkyns Event. We interpret the Jenkyns Event as a terrestrial crisis for ecosystems, marked especially by fl oral changes and the extinction of some dinosaur clades, both hervivores and carnivores.

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Early Toarcian (Jurassic) brachiopods from the Balearic Islands (Spain) and their paleobiogeographic context

et al. 2022

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The record of brachiopods in the Lower Toarcian of the Balearic Islands is described after a reassessment of previous works and new samplings in the Tramuntana Range of Mallorca. The recognized species have been assimilated to the assemblages described in the Iberian Range in the Tenuicostatum and Serpentinum biozones. Moreover, a detailed comparison with other Western Tethys basins and the study of the dispersion of the brachiopod faunas in relation with the Early Toarcian Oceanic Anoxic Event, allow to refine the paleobiogeographic relationship of the Balearic brachiopods. They belong to the Euro-Boreal Province of brachiopods in the Tenuicostatum Biochron and correspond to the”Spanish Fauna” that emerged after the deep paleobiogeographic disruption that took place at the base of Serpentinum Biochron. The occurrence of Prionorhynchia msougari Rousselle in the Serpentinum Zone of Mallorca indicates that, within this last assemblage, there would be a closer connection between the Balearic region and the southern margin of the Tethys (Betic and North African basins) than with the northern margin (Eastern Iberian Platform System and Eastern Pyrenees). This paleobiogeographic conclusion is consistent with the supposed position of the Balearic area in the Early Toarcian, on the southeastern margin of Iberia and near the Alboran and Kabylian margins.

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Changes in benthic microfossil assemblages before, during and after the early Toarcian biotic crisis in the Portland-Wight Basin (Kerr McGee 97/12-1 well, offshore southern England)

Cited by 11 publications

References 118 publications

Ostrácodos del tránsito Cenomaniense-Turoniense en los Montes Ksour y Amour (Atlas Sahariano): sistemática e implicaciones paleobiogeográficas

Ostrácodos del tránsito Cenomaniense-Turoniense en los Montes Ksour y Amour (Atlas Sahariano): sistemática e implicaciones paleobiogeográficas

Dinosaur extinctions related to the Jenkyns Event (early Toarcian, Jurassic)

Early Toarcian (Jurassic) brachiopods from the Balearic Islands (Spain) and their paleobiogeographic context

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