Syndesmorion gen. nov.—A coenobial alga of Chlorococcalean affinity from the continental Permian–Triassic deposits of Dalongkou section, Xinjiang Province, China

Foster, C.B.; Afonin, Sergey

doi:10.1016/j.revpalbo.2005.09.003

Cited by 13 publications

(15 citation statements)

References 9 publications

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“…Assemblage 2: Klausipollenites schaubergeri -Reduviasporonites chalastus -Syndesmorion stellatum; upper lower Guodikeng Formation, North Limb (seven samples: 3380, 3381, 3501 to 3504, 3361). In general, assemblages are dominated by the eponymous taxa; non-taeniate pollen grains and abundant algal remains (see Foster and Afonin, 2006): palynomorphs may be strongly corroded. Gymnosperm pollen assigned to Scutasporites sp.…”

Section: Palynologymentioning

confidence: 99%

“…Detailed results of palaeomagnetic studies, which utilise the same stratigraphic sections and use samples collected at the same time and recorded on the same sections presented here are being published elsewhere in this special issue (Glen et al). Some results of the palynological studies relating to algae (Foster et al, 2002;Foster and Afonin, 2006) and abnormal pollen grains have already been published by our group.…”

Section: Introductionmentioning

confidence: 97%

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Stratigraphy, biostratigraphy and C-isotopes of the Permian–Triassic non-marine sequence at Dalongkou and Lucaogou, Xinjiang Province, China

Metcalfe

Foster

Afonin³

et al. 2009

Journal of Asian Earth Sciences

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Section: Palynologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Stratigraphy, biostratigraphy and C-isotopes of the Permian–Triassic non-marine sequence at Dalongkou and Lucaogou, Xinjiang Province, China

Metcalfe

Foster

Afonin³

et al. 2009

Journal of Asian Earth Sciences

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“…The succession at Dalongkou has been studied by various workers (e.g., Afonin and Foster 2005; Foster and Afonin 2006) and has served as a touchstone for the PTB in western China (Metcalf et al 2009). The outcrops are located to the southwest of Jimsar.…”

Section: Localities Stratigraphy Depositional Environmentsmentioning

confidence: 99%

The Taphonomic Character, Occurrence, and Persistence of Upper Permian–lower Triassic Plant Assemblages in the Mid-Paleolatitudes, Bogda Mountains, Western China

Gastaldo

Wan

Yang

2023

Palaios

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The Bogda Mountains, Xianjiang Uygur Autonomous Region, western China, expose an uppermost Permian–Lower Triassic succession of fully continental strata deposited across three graben (half graben) structures in the mid-paleolatitudes of Pangea. A cyclostratigraphy scheme developed for the succession is subdivided into three low-order cycles (Wutonggou, Jiucaiyuan, Shaofanggou). Low-order cycles are partitioned into 1838 high-order cycles based on repetitive environmental changes, and their plant taphonomic character is assessed in > 4700 m of high-resolution, measured sections distributed across ∼ 100 km. Four taphonomic assemblages are represented by: permineralized wood (both autochthonous and allochthonous), megafloral adpressions (?parautochthonous and allochthonous) identifiable to systematic affinity, unidentifiable (allochthonous) phytoclasts concentrated or disseminated on bedding, and (autochthonous) rooting structures of various configurations (carbon films to rhizoconcretions). Their temporal and spatial occurrences vary across the study area and are dependent on the array of depositional environments exposed in any particular locality. Similar to paleobotanical results in other fully continental basins, megafloral elements are rarely encountered. Both wood (erect permineralized stumps and prostrate logs) and adpressions are found in < 2% of meandering river and limnic cycles, where sediment accumulated under semi-arid to humid conditions. The absence of such assemblages in river-and-lake deposits is more likely related to physical or geographical factors than it is to an absence of organic-matter contribution. With such a low frequency, no predictable pattern or trend to their occurrence can be determined. This is also true for any horizon in which rooting structures are preserved, although paleosols occur in all or parts of high-order cycles developed under arid to humid conditions. Physical rooting structures are encountered in only 23% of these and are not preserved equally across space and time. Allochthonous phytoclasts are the most common taphonomic assemblage, preserved in association with micaceous minerals on bedding in fine-grained lithofacies. The consistency of phytoclast assemblages throughout the succession is empirical evidence for the presence of riparian vegetation during a time when models propose the catastrophic demise of land plants, and does not support an interpretation of vegetational demise followed by long-term recovery across the crisis interval in this basin. These mesofossil and microfossil (palynological) assemblages offer the best opportunity to understand the effects of the crisis on the base of terrestrial ecosystems.

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“…Remarks. This environment-dependent species was attributed to the late Permian due to its presence in the samples between 65 and 95 m above the base of Guodikeng Formation (eastern China), where Foster and Afonin (2006) described different morphotypes and Metcalfe et al (2009) referred to the Klausipollenites schaubergeri-Reduviasporonites chalastus-Syndesmorion stellatum assemblage (latest Permian). Metcalfe et al (2009) concluded that the uppermost Guodikeng Formation can be interpreted as Lower Triassic based on palynofloras and Liu et al (2019) tentatively assumed a Changhsingian-early Induan age for the unit.…”

Section: Syndesmorion Stellatum (Fijałkowska) Foster and Afonin 2006mentioning

confidence: 99%

Age constraints of the Guttulapollenites hannonicus–Cladaitina veteadensis Biozone in Argentina reveal the first record of Early Triassic (Olenekian) palynofloras in Western Gondwana

et al. 2022

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The upper Palaeozoic basins of central-western Argentina include continuous fossiliferous successions spanning the Carboniferous-Permian interval. The palynostratigraphic biozones comprise Late Mississippian, Pennsylvanian and Cisuralian assemblages. Recently, new palynofloras of the La Veteada Formation were referred to the Lopingian (late Permian). However, they are characterized by spores and tetrads of Lundbladispora spp. and Densoisporites spp., pollen grains of Lunatisporites pellucidus, L. noviaulensis and Protohaploxypinus samoilovichii, and the alga Syndesmorion stellatum, that distinguish the post-Permian recovery floras worldwide. A new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and allows the identification of the first Early Triassic palynofloras in this region of western Gondwana. Comparison and correlation with similar assemblages from the southern and northern hemispheres supports the Early Triassic turnover with an increase of lycopsid cavate spores associated with some diagnostic species of taeniate and non-taeniate bisaccate pollen.

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Syndesmorion gen. nov.—A coenobial alga of Chlorococcalean affinity from the continental Permian–Triassic deposits of Dalongkou section, Xinjiang Province, China

Cited by 13 publications

References 9 publications

Stratigraphy, biostratigraphy and C-isotopes of the Permian–Triassic non-marine sequence at Dalongkou and Lucaogou, Xinjiang Province, China

Stratigraphy, biostratigraphy and C-isotopes of the Permian–Triassic non-marine sequence at Dalongkou and Lucaogou, Xinjiang Province, China

The Taphonomic Character, Occurrence, and Persistence of Upper Permian–lower Triassic Plant Assemblages in the Mid-Paleolatitudes, Bogda Mountains, Western China

Age constraints of the Guttulapollenites hannonicus–Cladaitina veteadensis Biozone in Argentina reveal the first record of Early Triassic (Olenekian) palynofloras in Western Gondwana

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