New range data for marine invertebrate species across the early Toarcian (Early Jurassic) mass extinction

Caswell, Bryony A.; Coe, Angela L.; Cohen, A. S.

doi:10.1144/0016-76492008-0831

Cited by 108 publications

(80 citation statements)

References 67 publications

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“…2). This oxygen isotope spike coincides with widespread anoxia during the event, as evidenced, e.g., by positive molybdenum isotope values, enhanced redox-sensitive trace element concentrations, increased total organic carbon preservation, and benthic extinctions (3,8,(18)(19)(20). The δ 13 C bel-carb values in the following falciferum subzone, which are mainly derived from Acrocoelites, are distinctly more variable (+1‰ to +5‰) compared with values found in Passaloteuthis of the tenuicostatum zone (+1‰ to +3‰) (Fig.…”

Section: Resultsmentioning

confidence: 77%

Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution

Ullmann

Thibault

Ruhl

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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Significance The Toarcian oceanic anoxic event (OAE; ∼183 million y ago) is marked by one of the largest carbon cycle perturbations in Earth history, rapid climate change, widespread ocean oxygen deficiency, and strong changes in marine ecosystems. The temporal links between increasing atmospheric p CO 2 , changes in ocean oxygen availability, and marine biotic response during this event are still poorly understood. Here we use isotopic analyses of calcite and organic matter from belemnites, marine predators of that time, to address their response to bottom water anoxia during the OAE. We infer that some belemnite taxa showed resilience to a strong reduction in ocean oxygen availability and occupied ecological niches in the Cleveland Basin (United Kingdom), enabling a strong evolutionary diversification after the event.

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Section: Resultsmentioning

confidence: 77%

Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution

Ullmann

Thibault

Ruhl

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…2; Fig. DR2), all interpreted as epifaunal, suspension-feeding opportunists tolerant to low oxygen conditions (Caswell et al, 2009).…”

Section: Environmental and Biotic Change Through Timementioning

confidence: 99%

Environmental controls on Jurassic marine ecosystems during global warming

Danise¹,

Twitchett²,

Little³

2015

Geology

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The fossil record has the potential to provide valuable insights into species response to past climate change if paleontological data are combined with appropriate proxies of environmental change. Here we use a novel, multivariate approach that combines a suite of geochemical proxies with high-resolution quantitative macroinvertebrate fossil data to study responses to early Toarcian warming (ca. 183 Ma). We show that benthic and nektonic ecosystems became decoupled during warming and were driven by different environmental variables. Benthic turnover was mostly driven by variations in seawater dissolved oxygen concentration, whereas turnover among the nektonic cephalopods was primarily controlled by variations in weathering, nutrient runoff, and primary productivity. Although rapid warming has been invoked as the main trigger of this event, the paleotemperature proxy was a poor predictor of marine community dynamics, and abiotic factors indirectly linked to temperature were more important. Given that similar environmental changes characterize other episodes of global warming and are impacting present-day marine communities, we predict that similar ecological responses occurred during other past events and are a probable outcome of current changes.

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“…An exception is an interesting fauna of Pseudomytiloides and Oxytoma inequivalvis (Paredes et al 2013a, b), a fauna that has been associated with oxygen-deficient waters of northwestern European Early Toarcian (e.g. Schmid-Rohl et al 2002, Wignall et al 2005, Caswell et al 2009). Thus, the sedimentary evidence identified in the Raricostatum Chronozone is correlated with a major transgressive event, observed in other points of the basin, such as Peniche, Figueira da Foz and Montemor-o-Velho ( Fig.…”

Section: Palaeoenvironmental Interpretation and Diagenesismentioning

confidence: 99%

Carbon isotope stratigraphy and ammonite biochronostratigraphy across the Sinemurian-Pliensbachian boundary in the western Iberian margin

Duarte¹,

Comas-Rengifo²,

Silva³

et al. 2014

Bull. Geosci.

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Here, we present an integrated stratigraphical study across the Sinemurian-Pliensbachian interval cropping out into the Portuguese reference section of S. Pedro de Moel (Lusitanian Basin). Characterized by marl-limestone alternations of the Água de Madeiros Formation (subdivided into Polvoeira and Praia da Pedra Lisa members), this succession is particularly dominated by organic-rich facies (black shales) and contains a diverse fauna of benthic and nektonic macrofossils. This stratigraphic and sedimentary setting is the basis for a high-resolution carbon isotope study, constrained by new ammonite biochronostratigraphic determinations and other palaeontological data. The new ammonite collections characterize the Oxynotum and Raricostatum chronozones and the Raricostatum, Macdonnelli and Aplanatum subchronozones, and accurately identify the Sinemurian-Pliensbachian boundary in this western Iberian margin setting. Carbon isotope measurements were made from bulk carbonate (δ 13 C carb ) from 351 samples, representing the Oxynotum to earliest Jamesoni (early Taylori) Chronozone intervals. The carbon isotope values exhibited a large range, varying between +2.85‰ in the Oxynotum Subchronozone to very negative values observed in some limestone beds from the Raricostatum Subchronozone (lowest reaching -6.7‰), a variation clearly controlled by lithological and facies changes. Despite these strong anomalous isotopically light values (below -2‰), which are clearly associated with organic matter degradation and early diagenesis, the δ 13 C carb curve shows a long-term negative trend across the Oxynotum to the early Taylori Subchronozone interval. This tendency is reversed around 5 m above the Sinemurian-Pliensbachian boundary, and the δ 13 C carb values become positive correlative with an absence of organic matter and argillaceous sediments in the limestone beds of Praia da Pedra Lisa Member. Although the δ 13 C data recorded across the Sinemurian-Pliensbachian of the Lusitanian Basin had been controlled by internal depositional conditions, the general evolution of carbon isotopes agrees with the trend recognized in other basins.• Key words: carbon isotopes, ammonite biochronostratigraphy, organic-rich marly limestone, Sinemurian-Pliensbachian boundary, Portugal. DUARTE, L.V., COMAS-RENGIFO, M.J., SILVA, R

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New range data for marine invertebrate species across the early Toarcian (Early Jurassic) mass extinction

Abstract: 2009 2 A compilation of Late Pliensbachian and Early Toarcian marine biotic 3 changes 4 5

Cited by 108 publications

References 67 publications

Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution

Effect of a Jurassic oceanic anoxic event on belemnite ecology and evolution

Environmental controls on Jurassic marine ecosystems during global warming

Carbon isotope stratigraphy and ammonite biochronostratigraphy across the Sinemurian-Pliensbachian boundary in the western Iberian margin

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