Darriwilian (Middle Ordovician) chemostratigraphy linked to graptolite, conodont and trilobite biostratigraphy in the Fågelsång-3 drill core, Scania, Sweden

Bergström, Stig M.; Ahlberg, Per; Maletz, Jörg; Lundberg, Frans; Joachimski, Michael M.

doi:10.1080/11035897.2018.1466833

Cited by 16 publications

(3 citation statements)

References 33 publications

(31 reference statements)

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“…The lower Darriwilian stratigraphic framework in Baltoscandia is based on trilobite, conodont, chitinozoan and graptolite biostratigraphy, which, in combination with lithostratigraphy, forms the foundation of traditional regional stages and substages (for overview see Nõlvak et al 2006;Pärnaste et al 2013). Graptolites are found abundantly only in the deepest part of the basin (Bergström et al 2018), and thus conodonts and chitinozoans provide the most convenient correlation tools in this interval. The Kunda Regional Stage of the Baltoscandian chronostratigraphic subdivision, which hosts all finds of Vikisphaera, Bergström et al (2009).…”

Section: Geological Background and Stratigraphymentioning

confidence: 99%

Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

Hints¹,

Liang²,

Nõlvak³

2021

EJES

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Section: Geological Background and Stratigraphymentioning

confidence: 99%

Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

Hints¹,

Liang²,

Nõlvak³

2021

EJES

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“…Lithostratigraphy, conodont biostratigraphy and age constraints of the studied section of the Borenshult-1 drillcore showing the stratigraphic distribution of trilete spores and cryptospores. Conodont zonation is based on Bergström et al (2011Bergström et al ( , 2018 and was subsequently tied to graptolite and chitinozoan biostratigraphy. Absolute ages (red) are based on biostratigraphic and radiometric ties to the International Stratigraphical Chart 2018 (Cohen et al 2018) combined with U-Pb zircon dates from Lindskog et al (2017).…”

Section: Geological Backgroundmentioning

confidence: 99%

Baltica cradle of early land plants? Oldest record of trilete spores and diverse cryptospore assemblages; evidence from Ordovician successions of Sweden

Rubinstein

Vajda

2019

GFF

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The origin of land plants is one of the most important evolutionary events in Earth's history. The mode and timing of the terrestrialization of plants remains debated and previous data indicate Gondwana to be the center of land-plant radiation at~470-460 Ma. Here we present the oldest occurrences of trilete spores, probably the earliest traces of vascular land plants yet recorded. The spores occur in Ordovician, Sandbian (455 million years old) successions in central Sweden, once part of the paleocontinent Baltica. These strata are independently dated by marine microfossils (conodonts) and 206 Pb/ 238 U dating of volcanic ash deposits. Our discovery extends the record of trilete spores globally by~8 million years, and for Baltica by~25 million years. Additionally, cryptospore assemblages are identified revealing a diverse and stable mid-Ordovician (Darriwilian:~460 Ma) vegetation of free-sporing plants. The formation of regolith substrates on land as a consequence of permanent plant cover must in turn have affected the marine biota. We link these early land plant spore occurrences to the extensive, nutrient-rich volcanic ash deposits and propose Baltica as the possible original region of the radiation of early land plants. ARTICLE HISTORY

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“…As a current reference, Bergström, Ahlberg, Maletz, Lundberg, and Joachimski (2018) evaluated the relationships between the Kargarde conodont zones and the Fågelsång graptolite zones, based on the Darriwilian chemostratigraphy in the Fågelsång-3 drill core, Scania, Sweden.…”

mentioning

confidence: 99%

Conodont and graptolite biostratigraphy of the lower–middle Darriwilian (Middle Ordovician), Cerro Viejo of Huaco, Argentine Precordillera

2018

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The distribution of conodonts and graptolites from the upper 13 m of the San Juan Formation and the first metre of the lower member of the Los Azules Formation, Los Gatos and Amarilla creeks, Cerro Viejo of Huaco, Central Precordillera from San Juan, Argentina, is studied. The conodonts from the top stratum of the San Juan Formation at the Los Gatos creek section correspond to the Lenodus variabilis Zone, whereas at the Amarilla creek section, they represent the Yangtzeplacognathus crassus Zone, verifying the diachronous top surface of the San Juan Formation. In the lower member of the Los Azules Formation, 81 conodont elements are recorded from bedding plane surfaces, where the presence of Paroistodus horridus horridus (Barnes & Poplawski) allows to recognize the Y. crassus Zone. On the basis of the graptolite and conodont association, we estimate that the top of the San Juan Formation at Los Gatos creek corresponds to the Levisograptus dentatus Zone, L. dentatus Subzone, whereas at the Amarilla creek, the Arienigraptus angulatus Subzone of the same zone is represented. The presence of the graptolite A. angulatus (Mu) in the lower member of the Los Azules Formation in both sections indicates the L. dentatus Zone (A. angulatus Subzone). The records of graptolites in limestones of the San Juan Formation and of abundant conodonts on bedding plane surfaces of the lower member of the Los Azules Formation are important, taking into account the type of facies where they occur. The conodont records in the referred type of preservation are scarce in the Ordovician, which allows for a more precise biostratigraphic correlation between conodont and graptolite biostratigraphy.

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Darriwilian (Middle Ordovician) chemostratigraphy linked to graptolite, conodont and trilobite biostratigraphy in the Fågelsång-3 drill core, Scania, Sweden

Cited by 16 publications

References 33 publications

Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

Possible metazoan egg fossils from the Darriwilian (Middle Ordovician) of Baltoscandia

Baltica cradle of early land plants? Oldest record of trilete spores and diverse cryptospore assemblages; evidence from Ordovician successions of Sweden

Conodont and graptolite biostratigraphy of the lower–middle Darriwilian (Middle Ordovician), Cerro Viejo of Huaco, Argentine Precordillera

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