Conodont biostratigraphy, and δ<sup>13</sup>C and δ<sup>34</sup>S isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden

Bergstroem, Stig M.; Eriksson, Mats E.; Young, Seth A.; Widmark, Eva-Marie

doi:10.1080/11035897.2012.758169

Cited by 12 publications

(12 citation statements)

References 65 publications

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“…Regional stages follow those of Nõlvak et al (2006). Graptolite zonation is based on Loydell (1991), Loydell & Maletz (2002), Nõlvak & Goldman (2007) and Melchin et al (2011), chitinozoan zonation is based on Nõlvak & Grahn (1993), and conodont zonation is based on Bergström (1971Bergström ( , 2007 and Bergström et al (2010Bergström et al ( , 2011Bergström et al ( , 2012aBergström et al ( , 2012b. The age of the Osmundsberget K-bentonite is taken from Bergström et al (2008).…”

Section: Methodsmentioning

confidence: 99%

“…Both excursions in the two sections in the Siljan district span ca. 2 m interval, while it spans as much as 5 m in Estonia, where the excursion is in the Tanuchitina bergstroemi Biozone (Kaljo et al 2007), corresponding to the lower part of the Dicellograptus complanatus Biozone (Bergström et al , 2012a. In the Osmundsberget 1 section, the most likely interval for the Moe excursion is obscured, e.g.…”

Section: The Moe Excursionmentioning

confidence: 95%

“…Bergström 2007;Suzuki et al 2009;Rasmussen et al 2010;Bergström et al 2012a). By the very nature of the outcrops in the Siljan district, most of our knowledge is gathered from the Boda Limestone mud mounds, although new drill core studies have shown that our understanding of the classical stratigraphical succession in the Siljan district may be complicated by the presence of different facies belts to the west (Lehnert et al 2012(Lehnert et al , 2013.…”

Section: The Terminal Ordovician In the Siljan Districtmentioning

confidence: 98%

“…The asterix at the top of the Kullsberg section is the HB lowstand of Bergström et al (2006). K 1 and K 2 refer to the so-called Klingkalk, placed either low in the section (Thorslund 1935) or high in the section (Bergström 2007;Bergström et al 2012a), respectively. Conodont data in the Kullsberg section are from Bergström (2007).…”

Section: The Boda Limestone Mound Faciesmentioning

confidence: 99%

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Terminal Ordovician stratigraphy of the Siljan district, Sweden

Ebbestad

Högström

Frisk

et al. 2014

GFF

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Integration of new isotopic data and earlier biostratigraphic information from eight sections through the terminal Ordovician (Pirgu and Porkuni stages) of the Siljan district, Sweden, allows a more precise correlation of sections in terms of biostratigraphy and carbon isotope dating. Four levels with positive d 13 C excursions are identified (from bottom) -the Moe, an unnamed excursion, Paroveja and Hirnantian Carbon Isotope Excursion (HICE). The d 13 C values through the Boda Limestone are 1 -2‰ higher than usual in Baltica, only the values for the HICE remains within what is expected. Background values increase from 1.5‰ in the bottom of the core of the Boda Limestone up to 3‰ in the top of it. The HICE is identified in five of eight sections and the main peak falls according to inferred correlation within the Metabolograptus persculptus Biozone, at or close to the Hindella beds in the Upper Boda Member. The late Katian (Pirgu) age of Holorhynchus in the Siljan district is clear and its co-occurrence with the chitinozoan Belonechitina gamachiana in Estonia supports a Katian age for this zone. The base of the Ozarkodina hassi Biozone may occur within units B -C of the Upper Boda Member and in the upper part of the Loka Formation and most likely is correlated with the M. persculptus Biozone. The HirnantiaDalmanitina faunas reported from the lowermost part of the Loka Formation and units B-D of the Upper Boda Member seem to range through all the Hirnantian, but detailed morphological studies allow to distinguish an older (¼extraordinarius) and a younger (¼ persculptus) fauna.

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Section: Methodsmentioning

confidence: 99%

Section: The Moe Excursionmentioning

confidence: 95%

Section: The Terminal Ordovician In the Siljan Districtmentioning

confidence: 98%

Section: The Boda Limestone Mound Faciesmentioning

confidence: 99%

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Terminal Ordovician stratigraphy of the Siljan district, Sweden

Ebbestad

Högström

Frisk

et al. 2014

GFF

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“…Loydell et al 1993;Loydell & Maletz 2002 and the Stimulograptus sedgwickii Biozone is shown on figures describing this section and others in the Siljan region of Dalarna (e.g. Bergström et al 2008Bergström et al , 2012Inanli et al 2009), the precise level of the Aeronian/Telychian boundary is yet to be established as is whether these sections are stratigraphically complete through this interval. Similarly, provide a preliminary account of the graptolite biozonation of the Röstånga-1 core from Scania, but until a thorough study is completed, the nature of the Aeronian/Telychian boundary here will remain uncertain.…”

Section: Aeronian/telychian Boundary Sectionsmentioning

confidence: 99%

The Aeronian/Telychian (Llandovery, Silurian) boundary, with particular reference to sections around the El Pintado reservoir, Seville Province, Spain

Loydell¹,

Frýda

Gutiérrez-Marco

2015

Bull. Geosci.

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The upper Aeronian to lower Telychian (Llandovery Series, lower Silurian) strata at the east end of El Pintado reservoir, Seville Province, Spain are documented in terms of their lithologies, graptolite biostratigraphy and δ 13 C org record. This is the first time that a continuously graptolitic section throught the Aeronian/Telychian boundary has been studied in detail. The upper Aeronian part of the section is assigned to the Stimulograptus halli Biozone which is divisible into three, the middle part being referred to the Lituigraptus rastrum Subzone. The Telychian strata are assigned to the Spirograptus guerichi Biozone and lower Sp. turriculatus Biozone. Unusually, two specimens of Sp. turriculatus were found at a level low in the guerichi Biozone. 118 graptolite species are recorded, 18 of which are new and described here together with other species for which the El Pintado material provides new information. Diversity increases considerably in some genera (Glyptograptus, Parapetalolithus, Rastrites, Streptograptus) in the upper halli Biozone and/or lower to middle guerichi Biozone only to decline again (except for Streptograptus) in the upper part of the guerichi Biozone as part of the "utilis Event". This diversity decline coincides with an interval of elevated δ 13 C org values. There are no major δ 13 C org excursions present in the El Pintado sections. The δ 13 C org record through the guerichi Biozone is very similar to that in Arctic Canada. Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK; david.loydell@port.ac.uk • Jiří Frýda, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 21, Praha 6 and Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic;, Facultad de Ciencias Geológicas, E-28040 Madrid, Spain; jcgrapto@ucm.es Our knowledge of the geological column is remarkably patchy. For some stratigraphical intervals numerous papers exist documenting sections, their contained fossils and chemostratigraphical record. Other intervals -unfortunately these are often around chronostratigraphical boundaries -are remarkably bereft of useful published stratigraphical data. This is usually because of the paucity or even absence of sections without major facies changes that are continuously fossiliferous. One such "unknown" interval has been the uppermost Aeronian to lowermost Telychian (middle to upper Llandovery Series). Recognition that the GSSP for the base of the Telychian Stage is unsatisfactory from a number of viewpoints (Temple 1988;Loydell 1993a;Davies et al. 2011Davies et al. , 2013 has heightened recent interest in the search for more informative sections. The aim of this paper is to document the upper Aeronian and lower Telychian graptolitic strata through sections on the shores of El Pintado reservoir in Seville Province, Spain and to discuss the bio-, chrono-and chemostratigraphy of this part of the Silurian System. The paper commences with a review of published sections, to indicate why the El Pintado sections are so important. It contin...

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The Upper Ordovician Pagoda positive δ13C excursion (PPCE) on the Upper Yangtze Platform, South China

Ogg

et al. 2022

Journal of Asian Earth Sciences

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Conodont biostratigraphy, and δ¹³C and δ³⁴S isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden

Cited by 12 publications

References 65 publications

Terminal Ordovician stratigraphy of the Siljan district, Sweden

Terminal Ordovician stratigraphy of the Siljan district, Sweden

The Aeronian/Telychian (Llandovery, Silurian) boundary, with particular reference to sections around the El Pintado reservoir, Seville Province, Spain

The Upper Ordovician Pagoda positive δ13C excursion (PPCE) on the Upper Yangtze Platform, South China

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Conodont biostratigraphy, and δ13C and δ34S isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden

Cited by 12 publications

References 65 publications

Terminal Ordovician stratigraphy of the Siljan district, Sweden

Terminal Ordovician stratigraphy of the Siljan district, Sweden

The Aeronian/Telychian (Llandovery, Silurian) boundary, with particular reference to sections around the El Pintado reservoir, Seville Province, Spain

The Upper Ordovician Pagoda positive δ13C excursion (PPCE) on the Upper Yangtze Platform, South China

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Conodont biostratigraphy, and δ¹³C and δ³⁴S isotope chemostratigraphy, of the uppermost Ordovician and Lower Silurian at Osmundsberget, Dalarna, Sweden