Palynology of the Permian and Triassic of the Tesero and Bulla sections (Western Dolomites, Italy) and consideration about the enigmatic species Reduviasporonites chalastus

Spina, Amalia; Cirilli, Simonetta; Utting, J.; Jansonius, Jan

doi:10.1016/j.revpalbo.2014.10.003

Cited by 36 publications

(19 citation statements)

References 21 publications

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“…Numerous palynological studies of the Late Permian contain relatively rich assemblages whereas the overlying Triassic sections appear impoverished or consist of a few samples only125557585960 and therefore emphasise the impression of an impoverished Early Triassic flora. A few well calibrated quantitative palynological records exist for the basal Triassic of the Barents Sea area as well as for the classical Early Triassic sections in the Salt Range and the Surghar Range in Pakistan, and based on recent radiometric age datings, for the Bowen Basin (eastern Australia)232425373940.…”

Section: Discussionmentioning

confidence: 99%

Severest crisis overlooked—Worst disruption of terrestrial environments postdates the Permian–Triassic mass extinction

Hochuli

Sanson-Barrera

Schneebeli‐Hermann

et al. 2016

Sci Rep

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Generally Early Triassic floras are believed to be depauperate, suffering from protracted recovery following the Permian–Triassic extinction event. Here we present palynological data of an expanded East Greenland section documenting recovered floras in the basal Triassic (Griesbachian) and a subsequent fundamental floral turnover, postdating the Permian–Triassic boundary extinction by about 500 kyrs. This event is marked by a swap in dominating floral elements, changing from gymnosperm pollen-dominated associations in the Griesbachian to lycopsid spore-dominated assemblages in the Dienerian. This turnover coincides with an extreme δ13Corg negative shift revealing a severe environmental crisis, probably induced by volcanic outbursts of the Siberian Traps, accompanied by a climatic turnover, changing from cool and dry in the Griesbachian to hot and humid in the Dienerian. Estimates of sedimentation rates suggest that this environmental alteration took place within some 1000 years. Similar, coeval changes documented on the North Indian Margin (Pakistan) and the Bowen Basin (Australia) indicate the global extent of this crisis. Our results evidence the first profound disruption of the recovery of terrestrial environments about 500kyrs after the Permian–Triassic extinction event. It was followed by another crisis, about 1myrs later thus, the Early Triassic can be characterised as a time of successive environmental crises.

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Section: Discussionmentioning

confidence: 99%

Severest crisis overlooked—Worst disruption of terrestrial environments postdates the Permian–Triassic mass extinction

Hochuli

Sanson-Barrera

Schneebeli‐Hermann

et al. 2016

Sci Rep

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“…This combination of simple sedimentary features and impoverished fossil biota dominated by fungi and bacterially generated amorphous organic matter is the terrestrial equivalent of anachronistic facies that are commonly recognized in marine strata in the aftermath of major extinction events (Maaleki-Moghadam et al, 2019). Proliferation of fungal/ algal remains (some of probable terrestrial origin) and amorphous organic matter is also a feature typical of post-EPE shallow marine palynoassemblages globally (Haig et al, 2015;Spina et al, 2015;Rampino and Eshet, 2018). Accumulation of the FBM occurred after the extinction of glossopterid-dominated arborescent peatland communities.…”

Section: Discussionmentioning

confidence: 94%

Age and Paleoenvironmental Significance of the Frazer Beach Member—A New Lithostratigraphic Unit Overlying the End-Permian Extinction Horizon in the Sydney Basin, Australia

McLoughlin

Nicoll²,

Crowley

et al. 2021

Front. Earth Sci.

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The newly defined Frazer Beach Member of the Moon Island Beach Formation is identified widely across the Sydney Basin in both outcrop and exploration wells. This thin unit was deposited immediately after extinction of the Glossopteris flora (defining the terrestrial end-Permian extinction event). The unit rests conformably on the uppermost Permian coal seam in most places. A distinctive granule-microbreccia bed is locally represented at the base of the member. The unit otherwise consists of dark gray to black siltstone, shale, mudstone and, locally, thin lenses of fine-grained sandstone and tuff. The member represents the topmost unit of the Newcastle Coal Measures and is overlain gradationally by the Dooralong Shale or with a scoured (disconformable) contact by coarse-grained sandstones to conglomerates of the Coal Cliff Sandstone, Munmorah Conglomerate and laterally equivalent units. The member is characterized by a palynological “dead zone” represented by a high proportion of degraded wood fragments, charcoal, amorphous organic matter and fungal spores. Abundant freshwater algal remains and the initial stages of a terrestrial vascular plant recovery flora are represented by low-diversity spore-pollen suites in the upper part of the unit in some areas. These assemblages are referable to the Playfordiaspora crenulata Palynozone interpreted as latest Permian in age on the basis of high precision Chemical Abrasion Isotope Dilution Thermal Ionization Mass Spectrometry (CA-IDTIMS) dating of thin volcanic ash beds within and stratigraphically bracketing the unit. Plant macrofossils recovered from the upper Frazer Beach Member and immediately succeeding strata are dominated by Lepidopteris (Peltaspermaceae) and Voltziopsis (Voltziales) with subsidiary pleuromeian lycopsids, sphenophytes, and ferns. Sparse vertebrate and invertebrate ichnofossils are also represented in the Frazer Beach Member or in beds immediately overlying this unit. The Frazer Beach Member is correlative, in part, with a thin interval of organic-rich mudrocks, commonly known as the “marker mudstone” capping the Permian succession further to the north in the Bowen, Galilee and Cooper basins. The broad geographic distribution of this generally <5-m-thick mudrock unit highlights the development in eastern Gondwana of extensive, short-lived, shallow lacustrine systems with impoverished biotas in alluvial plain settings in the immediate aftermath of the end-Permian biotic crisis.

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“…1), is among the most studied PTB successions in the Dolomites. It was first described by Leonardi (1935), and carefully analysed over the course of the last few decades from palaeontological, sedimentological and geochemical points of view (e.g., Bosellini, 1964; Neri & Pasini, 1985; Noé, 1987; Broglio Loriga et al, 1988; Magaritz et al, 1988; Wignall & Hallam, 1992; Beretta et al, 1999; Perri & Farabegoli, 2003; Chen et al, 2006; Groves et al, 2007; Posenato, 2009; Spina et al, 2015; Foster et al, 2017). The section became famous globally after the discovery of a “mixed brachiopod and mollusc fauna” located about 1.5–2.8 m above the BWFB, formerly considered to be coincident with the PTB (Neri & Pasini, 1985).…”

Section: Introductionmentioning

confidence: 99%

Echinoids from the Tesero Member (Werfen Formation) of the Dolomites (Italy): implications for extinction and survival of echinoids in the aftermath of the end-Permian mass extinction

Thompson

Posenato

Bottjer

et al. 2019

PeerJ

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The end-Permian mass extinction (∼252 Ma) was responsible for high rates of extinction and evolutionary bottlenecks in a number of animal groups. Echinoids, or sea urchins, were no exception, and the Permian to Triassic represents one of the most significant intervals of time in their macroevolutionary history. The extinction event was responsible for significant turnover, with the Permian–Triassic representing the transition from stem group echinoid-dominated faunas in the Palaeozoic to Mesozoic faunas dominated by crown group echinoids. This turnover is well-known, however, the environmental and taxonomic distribution of echinoids during the latest Permian and Early Triassic is not. Here we report on an echinoid fauna from the Tesero Member, Werfen Formation (latest Permian to Early Triassic) of the Dolomites (northern Italy). The fauna is largely known from disarticulated ossicles, but consists of both stem group taxa, and a new species of crown group echinoid,Eotiaris teseroensisn. sp. That these stem group echinoids were present in the Tesero Member indicates that stem group echinoids did not go extinct in the Dolomites coincident with the onset of extinction, further supporting other recent work indicating that stem group echinoids survived the end-Permian extinction. Furthermore, the presence ofEotiarisacross a number of differing palaeoenvironments in the Early Triassic may have had implications for the survival of cidaroid echinoids during the extinction event.

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Palynology of the Permian and Triassic of the Tesero and Bulla sections (Western Dolomites, Italy) and consideration about the enigmatic species Reduviasporonites chalastus

Cited by 36 publications

References 21 publications

Severest crisis overlooked—Worst disruption of terrestrial environments postdates the Permian–Triassic mass extinction

Severest crisis overlooked—Worst disruption of terrestrial environments postdates the Permian–Triassic mass extinction

Age and Paleoenvironmental Significance of the Frazer Beach Member—A New Lithostratigraphic Unit Overlying the End-Permian Extinction Horizon in the Sydney Basin, Australia

Echinoids from the Tesero Member (Werfen Formation) of the Dolomites (Italy): implications for extinction and survival of echinoids in the aftermath of the end-Permian mass extinction

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