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  • 1
    Online Resource
    Online Resource
    Onset, development, and cessation of basal Early Triassic microbialites (BETM) in the Nanpanjiang pull-apart Basin, South China Block
    Elsevier BV ; 2017
    In:  Gondwana Research Vol. 44 ( 2017-04), p. 178-204
    Details
    In: Gondwana Research, Elsevier BV, Vol. 44 ( 2017-04), p. 178-204
    Type of Medium: Online Resource
    ISSN: 1342-937X
    URL: Article
    DOI: 10.1016/j.gr.2016.11.013
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2017
    detail.hit.zdb_id: 2213685-X
    SSG: 13
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  • 2
    Online Resource
    Online Resource
    Conodonts from the E arly T riassic microbialite of G uangxi ( S outh C hina): implications for the definition of the base of the T riassic S ystem
    Wiley ; 2015
    In:  Palaeontology Vol. 58, No. 3 ( 2015-05), p. 563-584
    Details
    In: Palaeontology, Wiley, Vol. 58, No. 3 ( 2015-05), p. 563-584
    Abstract: We describe a new E arly T riassic ( G riesbachian) succession of conodont faunas from a high‐resolution sampling of the basal E arly T riassic microbial limestone and the base of the overlying unit at the W uzhuan section ( N anpanjiang B asin, G uangxi, S outh C hina). The microbial limestone records the earliest phase of the E arly T riassic biotic recovery after the end‐ P ermian mass extinction. For the first time, rich conodont faunas are reported from within the microbialite. The faunas from W uzhuan are largely dominated by anchignathodontids, including several I sarcicella species, which were previously documented only from strata above the microbialite. A total of 14 conodont species assigned to three genera is recorded from the W uzhuan section. Starting from the base of the microbialite upwards, several species are sequentially added to the conodont assemblage. The alpha diversity peaks at the top of the microbialite. The conodont record in the considered microbialite interval at W uzhuan is presumably unaffected by local ecological changes. It therefore more likely represents an evolutionary rather than an ecological pattern. We compare the W uzhuan's conodont record with a well‐supported phylogenetic model and suggest that the sequence of first occurrences at W uzhuan is the closest to the ‘true’ sequence of evolutionary events that took place during this G riesbachian radiation of anchignathodontids. Based on comparisons with the GSSP section at M eishan, we suggest further that the first occurrence of Hindeodus parvus in M eishan does not correspond to its first appearance datum.
    Type of Medium: Online Resource
    ISSN: 0031-0239 , 1475-4983
    URL: Issue
    URL: Article
    DOI: 10.1111/pala.2015.58.issue-3
    DOI: 10.1111/pala.12162
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2034710-8
    SSG: 13
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  • 3
    Online Resource
    Online Resource
    Competition in slow motion: the unusual case of benthic marine communities in the wake of the end‐ P ermian mass extinction
    Wiley ; 2015
    In:  Palaeontology Vol. 58, No. 5 ( 2015-09), p. 871-901
    Details
    In: Palaeontology, Wiley, Vol. 58, No. 5 ( 2015-09), p. 871-901
    Abstract: Changes of community structure in response to competition usually take place on timescales that are much too short to be visible in the geological record. Here we report the notable exception of a benthic marine community in the wake of the end‐ P ermian mass extinction, which is associated with the microbial limestone facies of the earliest T riassic of S outh C hina. The newly reported fauna is well preserved and extraordinarily rich (30 benthic macroinvertebrate species, including the new species A startella ? stefaniae ( B ivalvia) and E ucochlis obliquecostata ( G astropoda)) and stems from an environmentally stable setting providing favourable conditions for benthic organisms. Whereas changes in the taxonomic composition are negligible over the observed time interval of 10–100 ka, three ecological stages are identified, in which relative abundances of initially rare species continuously increased at the cost of previously dominant species. Concomitant with the changes of dominant species is an increase in faunal evenness and heterogeneity. In the absence of both environmental and taxonomic changes, we attribute this pattern to the long‐term effects of interspecific competition, which acted at an unusually slow pace because the number of competing species and potential immigrants was dramatically reduced by the end‐ P ermian mass extinction. We suggest that these non‐actualistic conditions led to decreased rates of niche differentiation and hence to the delayed rediversification of benthos that characterizes the aftermath of the greatest P hanerozoic mass extinction event. A hyperbolic diversification model is proposed, which accounts for the positive relationship between the intensity of interspecific competition and the rate of niche differentiation and resolves the conundrum of delayed rediversification at a time when niche space was largely vacated.
    Type of Medium: Online Resource
    ISSN: 0031-0239 , 1475-4983
    URL: Issue
    URL: Article
    DOI: 10.1111/pala.2015.58.issue-5
    DOI: 10.1111/pala.12186
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2034710-8
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    Timing of global regression and microbial bloom linked with the Permian-Triassic boundary mass extinction: implications for driving mechanisms
    Springer Science and Business Media LLC ; 2017
    In:  Scientific Reports Vol. 7, No. 1 ( 2017-03-06)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 7, No. 1 ( 2017-03-06)
    Abstract: New high-resolution U-Pb dates indicate a duration of 89 ± 38 kyr for the Permian hiatus and of 14 ± 57 kyr for the overlying Triassic microbial limestone in shallow water settings of the Nanpanjiang Basin, South China. The age and duration of the hiatus coincides with the Permian-Triassic boundary (PTB) and the extinction interval in the Meishan Global Stratotype Section and Point, and strongly supports a glacio-eustatic regression, which best explains the genesis of the worldwide hiatus straddling the PTB in shallow water records. In adjacent deep marine troughs, rates of sediment accumulation display a six-fold decrease across the PTB compatible with a dryer and cooler climate as indicated by terrestrial plants. Our model of the Permian-Triassic boundary mass extinction (PTBME) hinges on the synchronicity of the hiatus with the onset of the Siberian Traps volcanism. This early eruptive phase released sulfur-rich volatiles into the stratosphere, thus simultaneously eliciting a short-lived ice age responsible for the global regression and a brief but intense acidification. Abrupt cooling, shrunk habitats on shelves and acidification may all have synergistically triggered the PTBME. Subsequently, the build-up of volcanic CO 2 induced a transient cool climate whose early phase saw the deposition of the microbial limestone.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/srep43630
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 2615211-3
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  • 5
    Online Resource
    Online Resource
    A Unitary Association-based conodont biozonation of the Smithian–Spathian boundary (Early Triassic) and associated biotic crisis from South China
    Springer Science and Business Media LLC ; 2022
    In:  Swiss Journal of Palaeontology Vol. 141, No. 1 ( 2022-12)
    Details
    In: Swiss Journal of Palaeontology, Springer Science and Business Media LLC, Vol. 141, No. 1 ( 2022-12)
    Abstract: The Smithian–Spathian boundary (SSB) crisis played a prominent role in resetting the evolution and diversity of the nekton (ammonoids and conodonts) during the Early Triassic recovery. The late Smithian nektonic crisis culminated at the SSB, ca. 2.7 Myr after the Permian–Triassic boundary mass extinction. An accurate and high-resolution biochronological frame is needed for establishing patterns of extinction and re-diversification of this crisis. Here, we propose a new biochronological frame for conodonts that is based on the Unitary Associations Method (UAM). In this new time frame, the SSB can thus be placed between the climax of the extinction and the onset of the re-diversification. Based on the study of new and rich conodont collections obtained from five sections (of which four are newly described here) in the Nanpanjiang Basin, South China, we have performed a thorough taxonomical revision and described one new genus and 21 new species. Additionally, we have critically reassessed the published conodont data from 16 other sections from South China, and we have used this new, standardized dataset to construct the most accurate, highly resolved, and laterally reproducible biozonation of the Smithian to early Spathian interval for South China. The resulting 11 Unitary Association Zones (UAZ) are intercalibrated with lithological and chemostratigraphical (δ 13 C carb ) markers, as well as with ammonoid zones, thus providing a firm basis for an evolutionary meaningful and laterally consistent definition of the SSB. Our UAZ 8, which is characterized by the occurrence of Icriospathodus ex gr. crassatus , Triassospathodus symmetricus and Novispathodus brevissimus , is marked by a new evolutionary radiation of both conodonts and ammonoids and is within a positive peak in the carbon isotope record. Consequently, we propose to place the SSB within the separation interval intercalated between UAZ 7 and UAZ 8 thus leaving some flexibility for future refinement and updating.
    Type of Medium: Online Resource
    ISSN: 1664-2376 , 1664-2384
    URL: Article
    DOI: 10.1186/s13358-022-00259-x
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2587027-0
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