Anomalously diverse Early Triassic ichnofossil assemblages in northwest Pangea: A case for a shallow-marine habitable zone

Beatty, Tyler W.; Zonneveld, John‐Paul; Henderson, Charles M.

doi:10.1130/g24952a.1

Cited by 146 publications

(108 citation statements)

References 17 publications

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“…A substantial increase in species richness of faunas in well-oxygenated, shallow marine habitats during the Griesbachian time suggests that anoxia at greater depths has led to underestimation of the rediversification by benthos after the terminal Permian mass extinction (26,27). Trace fossil faunas also indicate a substantial diversification of burrowing taxa during the Dienerian and Spathian (26,28).…”

Section: Discussionmentioning

confidence: 99%

Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions

Stanley

2009

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

160

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Ammonoids and conodonts, being characterized by exceptionally high background rates of origination and extinction, were vulnerable to global environmental crises, which characteristically intensified background rates of extinction. Thus, it is not surprising that these taxa suffered conspicuous mass extinctions at the times of three negative Early Triassic global carbon isotopic excursions that resembled those associated with the two preceding Permian mass extinctions. In keeping with their high rates of origination, both the ammonoids and conodonts rediversified dramatically between the Early Triassic crises. Other marine taxa, characterized by much lower intrinsic rates of origination, were held at low levels of diversity by the Early Triassic crises; because global mass extinctions affect all marine life, these taxa must have experienced relatively modest expansions and contractions that have yet to be discovered, because they do not stand out in the fossil record and because the stratigraphic ranges of these taxa, being of little value for temporal correlation, have not been thoroughly studied.carbon isotopes ͉ Permian

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Section: Discussionmentioning

confidence: 99%

Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions

Stanley

2009

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

160

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“…A rich assemblage of Endoteba spp., Endotriada spp., and numerous nodosariids occurs. A recent paper of Beatty et al (2008) showed oxygenation linked to waves might preclude anoxia in shallow-marine settings. We can easily imagine that this Triassic atoll-type carbonates platform was subject to important wave action or storms.…”

Section: Fore-reefmentioning

confidence: 99%

Microfacies and depositional setting of the Upper Triassic mid-oceanic atoll-type carbonates of the Sambosan Accretionary Complex (southern Kyushu, Japan)

Chablais

Martini

Samankassou

et al. 2009

Facies

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The Upper Triassic shallow-water limestones of the Sambosan Accretionary Complex are reconstructed as a remnant of a mid-oceanic atoll-type build-up upon a seamount in the Panthalassan Ocean. The Sambosan atolltype carbonates and its pedestal were accreted along with deep-water ribbon-chert and related siliceous rocks to the eastern margin of Asia during the Late Jurassic to Early Cretaceous. Studied limestones crop out in southern Kyushu Island, southwest Japan. Although the prevailing and intense deformation during the accretionary process prevents measurement of sections in stratigraphic successions, and sedimentary structures are poorly preserved, microfacies description and foraminifers analysis allow us to speculate the depositional setting of the Sambosan limestones. Seventeen microfacies are distinguished and several foraminifers of Tethyan affinity are identified. Foraminifers indicate a Late Carnian to Rhaetian age. The Tethyan affinity of the macro-and microfaunas suggests that the Sambosan seamount was located presumably in a low-to middle-latitudinal zone of the southern hemisphere during the Late Triassic.

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“…Therefore, the shallow marine biotope in the Tesero section could have represented one of the last refuges for the last Permian marine stenotopic holdovers in the tropical Tethys, despite its being characterized by stunted individuals (Posenato, 2009). Shallow refuges (shore-face to off-shore transition) are also recorded by the trace fossils occurring at high latitudes (Canadian Panthalassa coast), where the wave aeration would have diminished the effects of oxygen depletion and allowed the surviving and quick biotic recovery of benthic organisms (Beatty et al, 2008).…”

Section: The Extinctions (Lower Tesero Member): Uppermost Changhsingimentioning

confidence: 96%

Marine biotic events in the Lopingian succession and latest Permian extinction in the Southern Alps (Italy)

Posenato

2010

Geological Journal

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The Upper Permian in the eastern Southern Alps consists of an overall transgressive sedimentary succession of continental red beds (Val Gardena Sandstone), which are overlain and interfingered by the marine Bellerophon Fm, consisting of sulphate evaporites, dolomites and neritic limestones. In the western Dolomites, a key-area for analyzing the stratigraphic framework and biotic events connected with the Permian-Triassic boundary and related mass extinction studies, the Bellerophon Fm is followed by oolitic limestone of the Werfen Fm, where the end-Permian mass extinction and the erathem boundary, located a few centimetres and few metres respectively above the formational contact.\ud The marine events presented here are located in three historical sections in the western Dolomites (Bletterbach, Seceda-Monte Balest, and Putia). Bioevents mostly concern brachiopod and cephalopod assemblages, discussed herein in terms of biodiversity changes and bio-chronostratigraphic value. Recent data on cephalopod and conodont biostratigraphy have improved significantly the chronostratigraphic framework of the upper part of the succession and its correlation with other Tethyan localities. As far as concerns nautiloids, the Tirolonautilus beds (T. crux and Tirolonautilus sebedinus lineage zone) are Changhsingian in age; while, all the Comelicania-bearing brachiopod beds are late Changhsingian in age.\ud The extinction pattern of the Dolomites is compared with that which occurred in the GSSP Meishan (South China) section. In both regions, the main extinction phase is probably synchronous, whereas the ultimate extinction of relicts is slightly diachronous. However, in the Dolomites the extinction seems to have been more catastrophic, because of the lack of the Chinese prelude phase, which is also characterized by miniaturization. On the other hand, the supposed coeval Dolomites assemblages have a high biodiversity, both in richness and abundance, and include gigantic brachiopod species

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Anomalously diverse Early Triassic ichnofossil assemblages in northwest Pangea: A case for a shallow-marine habitable zone

Cited by 146 publications

References 17 publications

Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions

Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions

Microfacies and depositional setting of the Upper Triassic mid-oceanic atoll-type carbonates of the Sambosan Accretionary Complex (southern Kyushu, Japan)

Marine biotic events in the Lopingian succession and latest Permian extinction in the Southern Alps (Italy)

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