Early Anisian (Middle Triassic) Conodonts from Romania and China, with Comments on Their Role in the Recognition and Correlation of the Base of the Anisian

Golding, Martyn

doi:10.1007/s12583-020-1392-9

Cited by 12 publications

(9 citation statements)

References 39 publications

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“…regalis , a group later assigned to Magnigondolella . These elements have recently been recognized as a new species by Golding (2021), who has provided a more complete description of the Chinese material, including several growth stages that imply juveniles may have had a pointed platform like that which characterizes Mg. acuminata . Retention of this juvenile morphology in mature Mg. acuminata is possible, as is the occurrence of the second species in Guando.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

North American Spathian (upper Olenekian, Lower Triassic) neogondolellin conodonts

Orchard

2021

Papers in Palaeontology

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The taxonomy and biostratigraphy of poorly known neogondolellin conodonts from mostly Spathian (upper Olenekian, Lower Triassic) strata are described from widespread localities in North America: high latitude Canadian Arctic, mid‐latitude British Columbia (BC), and lower latitudes in the USA. The occurrence of the neogondolellins in key sections and in matrix of dated ammonoid collections is documented. Neogondolellins characteristic of seven ammonoid zones are identified. Fifteen new conodont species are assigned to four genera: Borinella, Columbitella, Magnigondolella and Neogondolella. Borinella, more common in the Smithian, undergoes a radiation in the early Spathian ‘tirolitid n. gen. A’ ammonoid beds of California eventually resulting in five new Neogondolella species (Ng. bucheri, Ng. darwinensis, Ng. praeacuta, Ng. sinuosa, and later Ng. spathiconstricta) and the first new Magnigondolella, Mg. mutata. Several of these plus Bo.? curvata sp. nov. also occur above the tardus Zone in British Columbia (BC). In the next younger ammonoid zone with Tirolites, the first Columbitella are Cb. joanae and Cb. weitschati. Middle Spathian Columbites and Procolumbites ammonoid beds in the USA are dominated by Cb. elongata, whereas the broadly equivalent strata in the north contain Cb. amica, Cb. brevis sp. nov. and Cb. paragondolellaeformis. Late Spathian radiation produces six new species of Magnigondolella: Mg. incurva, Mg.? minuta and Mg. trutchensis in the Prohungarites ammonoid beds, followed by Mg. acuminata, Mg. tozeri and Mg. peribola in the haugi and subrobustus ammonoid zones.

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Section: Systematic Palaeontologymentioning

confidence: 99%

North American Spathian (upper Olenekian, Lower Triassic) neogondolellin conodonts

Orchard

2021

Papers in Palaeontology

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“…5). Golding (2021a), having in view the new ammonoid data in the Deşli Caira section that relocates the position of the Olenekian-Anisian boundary in this section (Grădinaru, in Grădinaru & Gaetani, 2019), re-examined the conodont taxonomy and biostratigraphy in the Deşli Caira section, Romania, which is the primary-ranked GSSP for OAB. He nominated new conodont taxa as potential biotic tools to be used in the recognition and correlation of the base of the Anisian Stage/Middle Triassic Series and having potential for more refined correlation of the lower Anisian between North America and Tethys.…”

Section: The Gssp Candidates For the Base Of The Anisian Having The Conodont Chiosella Timorensis As A Defunct Primary Biotic Proxymentioning

confidence: 99%

“…that have been chronostratigraphically tied to the FAD of the conodont Chiosella timorensis (e.g., Muttoni et al, 1994Muttoni et al, , 1995Muttoni et al, , 1996Muttoni et al, , 1998Muttoni et al, , 2019Atudorei & Baud, 1997;Atudorei, 1999;Atudorei et al, 2002;Hounslow & McIntosh, 2003;Grădinaru et al, 2007;Galfetti et al, 2007;Horacek et al, 2007Horacek et al, , 2009Hounslow et al, 2007Hounslow et al, , 2008Hounslow & Muttoni, 2010;Burgess et al, 2014;Lehrmann et al, 2015a-b;Li M et al, 2018b;Haq, 2018;Huang, 2018;Maron et al, 2019;Zhang L et al, 2019a-b;Ogg, 2019;Ogg et al, 2020b;Ha et al, 2019Ha et al, , 2021, for which now there are firm data proving that this conodont is a defunct proxy for the Olenekian-Anisian/Early-Middle Triassic boundary, all of them must be chronostratigraphically re-calibrated. All of them have to be tied to the new OAB, based on the newly acquired ammonoid/conodont biochronolgy in the Deşli Caira section, North Dobrogea, Romania (Grădinaru, in Grădinaru & Gaetani, 2019;Golding, 2021a). Thus, the excursions of all physical events around the Olenekian-Anisian/Early-Middle Triassic boundary, which have been previously tied to the FAD of Ch.…”

Section: The Gssp Candidates For the Base Of The Anisian Having The Conodont Chiosella Timorensis As A Defunct Primary Biotic Proxymentioning

confidence: 99%

“…In this case, all other secondary biotic markers, like the FO of diagnostic conodonts, and all non-biotic events, such as magnetostratigraphic, chemostratigraphic and others, may be used only as proxies to evaluate the synchrony of the primary biotic marker at different localities (see Lucas, 2007). The recent ammonoid/conodont biochronology in the Deşli Caira section (Grădinaru, in Grădinaru & Gaetani, 2018;Golding, 2021a) prompted the FAD of the Paracrochordiceras and Aegeiceras ammonoid assem-blage as the primary biotic marker for the OAB/EMTB, whilst the conodont species Chiosella timorensis, the FAD of which is now well bellow the OAB/EMTB, is disqualified to be used either as a primary biotic marker or as a secondary biotic marker/proxy for the nominated boundary, as it was promoted for a long time in the numerous dedicated publications.…”

Section: Introductionmentioning

confidence: 99%

“…This conclusion was adopted byGrădinaru et al ( , 2007 andOrchard et al (2007a) for the Deşli Caira section, and closely mimicked byOrchard et al (2007b) andLehrmann et al (2006Lehrmann et al ( , 2015a for the Guandao section in China. Discussing this matter,Golding (2021a) underlies that recently "Additional issues with Ch.…”

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2021

Actapalrom

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The conodont Chiosella timorensis (Nogami, 1968) has for a long time been considered to be a suitable biotic proxy for the Olenekian-Anisian/Early-Middle Triassic boundary. The recently acquired ammonoid record around that boundary clearly shows that the FAD of this conodont is located well below the boundary, i.e., in the late Spathian. In the present paper, it is underlined that the conodont Chiosella timorensis was promoted as a proxy for the nominated boundary in the early 1980s when the ammonoid record around the boundary was not yet well established. On the other side, until the mid 1990s the taxonomic definition and the lineage of the conodont Chiosella timorensis were not well stated, and even now there are still controversial interpretations of the taxonomic content of this conodont species. The new data achieved from the ammonoid/conodont record around the nominated boundary, especially in the western USA, and also in the Deşli Caira section in Romania, firmly demonstrate that the conodont Chiosella timorensis is a defunct proxy for the Olenekian-Anisian/Early-Middle Triassic boundary. As a consequence, the present data on the ammonoid-documented Olenekian-Anisian/Early-Middle Triassic boundary requires the recalibration of all physical events that have been tied to the FAD of the conodont Chiosella timorensis. The case of the Albanian Kçira-section, for which the chronostratigraphic interpretation of the ammonoid record is proved incorrect, definitely makes the conodont Chiosella timorensis a defunct proxy for the nominated boundary. Also, the case of the two Chinese sections recently proposed as being "exceptional" GSSP candidates for the Early-Middle Triassic boundary, which is based on an inconsistent ammonoid/conodont biochronology, fully strengthens this conclusion. The history of the controversial usage of the conodont species Chiosella timorensis in defining the Olenekian-Anisian boundary justifies a discussion about the usefulness of conodonts in the chronostratigraphic calibration of the standard Triassic timescale. One may conclude that the conodonts are not qualified, and have not a reasonable potential, to be used to define or to redefine the boundaries of chronostratigraphic units in the standard Triassic timescale, which have been basically defined on ammonoid biochronology.

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Note on Lower Triassic Gondolelloid Conodont Rediversifications with Emphasis on the Spathian Recovery

Kilic

2024

J. Earth Sci.

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Early Anisian (Middle Triassic) Conodonts from Romania and China, with Comments on Their Role in the Recognition and Correlation of the Base of the Anisian

Cited by 12 publications

References 39 publications

North American Spathian (upper Olenekian, Lower Triassic) neogondolellin conodonts

North American Spathian (upper Olenekian, Lower Triassic) neogondolellin conodonts

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Note on Lower Triassic Gondolelloid Conodont Rediversifications with Emphasis on the Spathian Recovery

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