Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System

Mitchell, CE; Chen, Xu; Bergstrom, SM; Zhang, YD; ZH(王志浩), Wang; Webby, B D; Finney, SC

doi:10.18814/epiiugs/1997/v20i3/003

Cited by 59 publications

(12 citation statements)

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“…As mentioned above, the base of the global Darriwilian Stage is defined by the first appearance of the graptolite Levisograptus austrodentatus (Mitchell et al . ), a level, which is close to the first occurrence of the conodont Lenodus antivariabilis (An) on Baltica (see Stouge & Nielsen ). However, because of a general lack of the graptolite species in the carbonate facies and the rare record of Lenodus antivariabilis in several of the studied sections, the base of Darriwilian has been placed, tentatively, at the first appearance of the conodont species Baltoniodus norrlandicus (Löfgren) (see also Cooper & Sadler ).…”

Section: Localities and Materialsmentioning

confidence: 67%

“…The base of the succeeding Darriwilian Stage, slice Dw1, is defined by the first appearance of the graptolite Levisograptus austrodentatus (Mitchell et al . ), which was placed at the base of Baltoniodus norrlandicus Zone by Cooper & Sadler (). The base of the next Darriwilian stage slice (Dw2) is defined by the first appearance of the graptolite Didymograptus artus Elles & Wood and the base of upper stage slice (Dw3) is defined by the appearance of conodont species Pygodus serra Hadding (Bergström et al .…”

Section: Lower and Middle Ordovician Conodont Biostratigraphy And Chrmentioning

confidence: 99%

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Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Rasmussen

Stouge

2018

Palaeontology

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The Middle Ordovician conodont genera that are suitable for palaeoenvironmental interpretations from the epicontinental Baltoscandian platform have been identified and evaluated to establish and describe conodont biofacies and their relationship to global cooling. The construction of biofacies was based on multivariate statistical analyses of more than 375 700 conodont specimens from 520 samples and 21 localities across Baltica. Three distinct, recurrent and laterally extensive conodont biofacies existed across the Baltoscandian platform of the Baltica continent during the Dapingian and early to middle Darriwilian stages (Middle Ordovician). A relatively shallow water conodont assemblage named the Baltoniodus–Microzarkodina Biofacies characterized the inner shelf localities in central Sweden, Estonia, Russia and Ukraine. In the distal shelf areas, patterns are more complex. Here, genera of the Periodon Biofacies characterized the shelf margin areas of the Scandinavian Caledonides facing the relatively warm Iapetus Ocean towards the north, whereas the Protopanderodus Biofacies dominated the distal shelf areas facing the cooler Tornquist Sea towards the south‐west. Although these three main biofacies continued to dominate during the succeeding Darriwilian stage, distinct changes in the distribution of biofacies took place during the transition from the Dapingian Stage to the Darriwilian. We argue that the biofacies change was triggered by a regressive event related to early Darriwilian cooling, and that the palaeoclimatological changes influenced the Baltic conodont faunas near the Tornquist Sea margin before those of the Iapetus margin (early vs middle Darriwilian).

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Section: Localities and Materialsmentioning

confidence: 67%

Section: Lower and Middle Ordovician Conodont Biostratigraphy And Chrmentioning

confidence: 99%

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Rasmussen

Stouge

2018

Palaeontology

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“…These graptolite assemblages enable the recognition of an early Darriwilian age for the bearer strata. To the south, at the La Corridita Creek, Gualcamayo River area, Brussa and Astini (2001) The L. austrodentatus Zone from northern Precordillera can be correlated with the L. austrodentatus Zone (Da1) of Australasia, and equivalent strata from China, Baltoscandia, Britain, and Russia (e.g., Bulman, 1963;Chen et al, 1995;Erdtmann, Maslov, Maletz, & Paalits, 1998;Fortey & Owens, 1987;Maletz, 1997;Mitchell et al, 1997;Mitchell & Maletz, 1995;VandenBerg & Cooper, 1992).…”

Section: Correlationmentioning

confidence: 99%

Lower middle Darriwilian (Ordovician) graptolites and index conodonts from the Central Precordillera of San Juan Province, Argentina

et al. 2017

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This study includes 3 localities from the Jáchal area in the Central Precordillera of San Juan Province, from north to south: the Oculta creek, Las Aguaditas creek, and Cerro La Chilca sections. We deal with the graptolite faunas and conodont index species recorded from units that overlie the carbonate San Juan Formation, spanning the lower part of the Los Azules, Las Aguaditas, and Gualcamayo formations in their respective areas. The index graptolites and associated species are reported, which enable the recognition of the Levisograptus dentatus Zone in the Central Precordillera. The presence of graptolites in the limestones from the top of the San Juan Formation at the Cerro La Chilca section is documented for the first time. The record of representatives of the Lenodus variabilis, Yangtzeplacognathus crassus, Eoplacognathus pseudoplanus, Histiodella, and Periodon lineages recognized in these units, linked with respective graptolite zones, provide precise information for global correlation purposes. The use of conodont and graptolite zones from different areas of the Central Precordillera enables the verification of the diachronous contact between the San Juan Formation and overlying units, which spans the lower to middle Darriwilian, in our investigated sections and classical localities previously documented.

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“…1988; VandenBerg and Cooper 1992). The base of the Levisograptus austrodentatus Biozone is now defined at the FAD of Levisograptus austrodentatus in the Huangnitang section, SW China (Mitchell and Maletz 1995; Mitchell et al . 1997), the stratotype for the base of the Darriwilian Stage.…”

Section: Biostratigraphymentioning

confidence: 99%

“… Biostratigraphical ranges of Levisograptus dentatus and other biserials in the early Darriwilian discussed in the text (composite range chart). Biozonation from Maletz (2009), Exigraptus clavus Biozone added from Mitchell et al . (1997).…”

Section: Biostratigraphymentioning

confidence: 99%

The identity of the Ordovician (Darriwilian) graptoliteFucoides dentatusBrongniart, 1828

Maletz¹

2011

Palaeontology

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Abstract:The biostratigraphically important Middle Ordovician (Darriwilian) biserial graptolite Fucoides dentatus Brongniart, 1828 is redescribed and illustrated from its type material and from additional specimens collected at the type locality -Lévis, Quebec, Canada. It is referred to Levisograptus gen. nov., which includes also the austrodentatus group of early axonophoran graptolites. The species has previously been confused with a younger, mid-Darriwilian species, now referred to as Eoglyptograptus gerhardi sp. nov., and recognized as the type species of the genus Eoglyptograptus Mitchell. Both species can be differentiated easily by their respective proximal development types and show nonoverlapping biostratigraphical ranges. Levisograptus dentatus (Brongniart) is an important biostratigraphical index species in the early Darriwilian. Eoglyptograptus species are found in the higher Darriwilian and are biogeographically restricted to the Atlantic Faunal Realm.

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Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System

Cited by 59 publications

References 0 publications

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Baltoscandian conodont biofacies fluctuations and their link to Middle Ordovician (Darriwilian) global cooling

Lower middle Darriwilian (Ordovician) graptolites and index conodonts from the Central Precordillera of San Juan Province, Argentina

The identity of the Ordovician (Darriwilian) graptoliteFucoides dentatusBrongniart, 1828

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