Lower-middle Darriwilian index conodonts from the Precordillera: new taxonomical approaches

Mestre, Ana; Heredia, Susana

doi:10.1007/s12549-019-00386-3

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…variabilis to L . pseudoplanus biozones; Ortega et al, 2007; Mestre and Heredia, 2013a, b, 2020a, b; Serra et al, 2015), in almost the same levels described in this work. This fauna is characterized by the presence of the obolids Glossella and Lingulasma , which are related to Laurentian and Baltic faunas, and the siphonotretid Chilcatreta , which was originally described as endemic to the Precordillera.…”

Section: Biogeographic Implications Of the San Juan Formation Linguliformeanssupporting

confidence: 83%

“…The Precordilleran Darriwilian conodont biostratigraphy has been improved significantly in recent years (Heredia and Mestre, 2011, 2013; Mestre and Heredia, 2013a, b, 2020a, b; Mestre, 2014; Serra et al, 2015; Feltes et al, 2016; Heredia et al, 2017; among others). Recently, Heredia et al (2017) and Mestre and Heredia (2020b) proposed an accurate Darriwilian conodont biostratigraphic chart, pointing out lower and upper limits, recording the Lenodus antivariabilis , Lenodus variabilis , Lenodus crassus , Lenodus pseudoplanus , Lenodus suecicus ( Pygodus lunnensis and Pygodus anitae subzones), Pygodus serra ( Eoplacognathus robustus and Eoplacognathus lindstroemi subzones), and lower Pygodus anserinus zones (Fig. 3).…”

Section: Geological Settingmentioning

confidence: 99%

“…The colored area represents the conodont biozone recorded in the study section. Baltoscandia (Bergström, 1971; Löfgren and Zhang, 2003), south-central China (Wang et al, 2018), Precordillera (Heredia et al, 2017; Heredia and Mestre, 2020b). …”

Section: Geological Settingmentioning

confidence: 99%

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Middle Ordovician linguliformean microbrachiopods from western Argentina: new data and biogeographic implications

2021

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New linguliform microbrachiopods from the Middle Ordovician are described and illustrated. This fauna was recovered from the uppermost beds of the San Juan Formation in two sections of the Central Precordillera (Argentina), which are accurately dated to the Lenodus pseudoplanus Zone (middle Darriwilian). The fauna consists of the obolid Luthieria diminuta n. gen. n. sp., and the acrotretids Eoconulus tucunucoensis n. sp., Conotreta andina Lavié, Serra, and Feltes, Scaphelasma zharykensis Popov, and Numericoma rowelli Holmer et al. This low-diversity lingulate association displays close similarities with coeval faunas that inhabited the Laurentia, Baltica, and Kazakhstanian regions, in agreement with evidence from other linguliform and rhynchonelliform brachiopods. UUID: http//zoobank.org/fe9acbb0-6654-4462-ba4d-ea2386ae79f6

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Section: Biogeographic Implications Of the San Juan Formation Linguliformeanssupporting

confidence: 83%

Section: Geological Settingmentioning

confidence: 99%

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Middle Ordovician linguliformean microbrachiopods from western Argentina: new data and biogeographic implications

2021

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“…P. horridus and P. macrodentatus are the most abundant species in the Darriwilian conodont fauna in the Precordillera, representing about the 50% of the population in the L. crassus and L. pseudoplanus zones, especially in western sections from the Central Precordillera, such as Las Chacritas river and Cerro La Chilca sections (Mestre, 2010;Serra et al, 2017b;Mestre and Heredia, 2020b). In other regions of the world, the genera Periodon and Paroistodus characterized deep and open-sea biotopes, occupying upper to lower slope environments (Stouge, 1984;Zhang, 1998a;Wu et al, 2014;among others).…”

Section: Paleoecological Remarks Of the Conodont Associationmentioning

confidence: 99%

“…Several extensive studies on conodonts recovered from different sections in Central and Eastern Precordillera (Heredia andMestre, 2011, 2013;Feltes et al, 2016;Heredia, 2013a, b, 2020a, b;Mestre, 2014;Heredia et al, 2017;Mango et al, 2019;Serra et al, 2017a) suggest affinity to Baltoscandia and South China for this time interval. Recently, Heredia et al (2017) and Mestre and Heredia (2020b) refined the Darriwilian conodont biostratigraphy for the Precordillera, recording the lower and upper boundaries of this stage and documented the following biozones (in ascending order): the Lenodus antivariabilis, Lenodus variabilis, Lenodus crassus, Lenodus pseudoplanus, Lenodus suecicus (Pygodus lunnensis and Pygodus anitae subzones), and Pygodus serra (with Eoplacognathus robustus and Eoplacognathus lindstroemi subzones).…”

Section: Introductionmentioning

confidence: 99%

Biostratigraphic and paleobiogeographic significance of the Darriwilian microfossils from the top of San Juan Formation in the Los Baños de Talacasto section, Central Precordillera (Argentina)

Mestre

Gallardo

Salas

et al. 2022

andgeo

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The microfossil hosted in the strata of the upper part of the San Juan Formation has been widely studied in several sections to the northward of the Argentinian Central Precordillera. In contrast, the coeval strata at the Los Baños de Talacasto section, in the southern part of the Central Precordillera, have scarce biostratigraphic and sedimentological data. In this work, a conodont association together with single ostracod species are documented for the first time in this section. The record of the Lenodus crassus and L. pseudoplanus zones confirms the Darriwilian age for these beds and accurately correlates them with equivalent strata of the San Juan Formation studied in several sections of the Central and Eastern Precordillera. The microfacies analysis verifies the presence of Nuia síbirica Maslov, 1954, peloids, intraclasts, cyanobacteria, calcareous algae, and a possible microbialite indicating a shallow warm-water subtidal environment, in equatorial to subequatorial climate. This suggests a low latitudes position for Precordillera during the early-middle Darriwilian. The conodont genus Aurilobodus Xiang and Zhang is recognized for the first time from the Precordillera, and the Aurilobodus leptosomatus An specimens are described and illustrated. This genus shows affinities to the warm water in shallow marine environments of North China, Central Asia, South Tibet, western Thailand, Australia, and Newfoundland, suggesting probable ties between Precordillera and these regions. The record of the ostracod Pilla nodospinosa Salas in the study section would agree with the correlation of the top of San Juan Formation with the lower levels of the Las Aguaditas Formation in the Central Precordillera, and also suggests paleobiogeographic links with Eastern Gondwana and Australia regions during the Darriwilian times.

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New early Ordovician conodont data from the San Juan Formation, Central Precordillera (Argentina): Biostratigraphic and paleogeographic significance

Moreno

Mestre

Heredia

2020

Journal of South American Earth Sciences

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Lower-middle Darriwilian index conodonts from the Precordillera: new taxonomical approaches

Cited by 8 publications

References 33 publications

Middle Ordovician linguliformean microbrachiopods from western Argentina: new data and biogeographic implications

Middle Ordovician linguliformean microbrachiopods from western Argentina: new data and biogeographic implications

Biostratigraphic and paleobiogeographic significance of the Darriwilian microfossils from the top of San Juan Formation in the Los Baños de Talacasto section, Central Precordillera (Argentina)

New early Ordovician conodont data from the San Juan Formation, Central Precordillera (Argentina): Biostratigraphic and paleogeographic significance

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