Integrated δ13Ccarb, conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group

McAdams, Neo E.B.; Cramer, Bradley D.; Bancroft, Alyssa M.; Melchin, Michael J.; Devera, Joseph A.; Day, Jed

doi:10.1130/b32033.1

Cited by 30 publications

(14 citation statements)

References 46 publications

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“…Total ranges of selected conodont taxa useful for dating of the strata. From left to right: chronostratigraphy; conodont biozonation after Cramer et al () and McAdams et al (); conodont biozonation (zonal groups and biozones) after Jeppsson (); ranges of conodont taxa based on data from Jeppsson (, ), Calner and Jeppsson (), Corriga, Corradini, and Ferretti (), Corradini and Corriga (), Slavík and Carls (), and Corradini, Corriga, Pondrelli, and Suttner ()…”

Section: Discussionmentioning

confidence: 99%

“…Distribution of conodonts and possible conodont biozones recognised from both landslides. Conodont biozonation is after Cramer et al () and McAdams et al ()…”

Section: Methodsmentioning

confidence: 99%

“…Succession of the Laojianshan section. From left to right: formation (JF, Jenhochiao Formation; XF, Xiangyangsi Formation); lithology; conodont samples (black rectangle – productive sample; red rectangle – barren sample); distribution of conodonts (solid line – continuous occurrence of a taxon; dotted line – sporadic occurrence of a taxon; filled circle – confident identification of a taxon; hollow circle – problematical identification of a taxon); conodont biozonation (zonal groups and biozones) after Jeppsson (); datums of the Ireviken Event (vertical lines mark a probable hiatus in the section); conodont biozonation after Cramer et al () and McAdams et al (); chronostratigraphy. Conodont biozones identified in this study are marked and distinguished by grey shadings of different intensity [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Setting and Section Descriptionmentioning

confidence: 99%

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Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China

et al. 2020

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The Baoshan region of Yunnan Province, SW China, is one of the best locations to study Wenlock to Pridoli conodonts in China. Detailed analysis of conodont collections from the Silurian strata (the “Lichaiba” and Niushiping formations) of the Laojianshan section in the Baoshan region resulted in revised dating of the section. In stratigraphically ascending order, the Pterospathodus amorphognathoides amorphognathoides Zonal Group, the Pterospathodus pennatus procerus Superbiozone (probably only the Lower Pterospathodus pennatus procerus Biozone), the Ozarkodina sagitta sagitta Biozone, the Kockelella ortus absidata Biozone, the Kockelella crassa Biozone, the Polygnathoides siluricus Biozone and the “Ozarkodina” eosteinhornensis s.l. Interval Biozone are recognised. The conodont faunas recovered indicate that the “Lichaiba Formation” corresponds to the upper Telychian–upper Wenlock, and the Niushiping Formation to the Ludlow–Pridoli. Part of the Ireviken Event, that is, from Datum 3 to Datum 4 can be recognised from the studied section. The late Telychian conodont fauna from the Laojianshan section is characteristic of distal, open‐shelf depositional environments.

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Section: Discussionmentioning

confidence: 99%

“…Distribution of conodonts and possible conodont biozones recognised from both landslides. Conodont biozonation is after Cramer et al () and McAdams et al ()…”

Section: Methodsmentioning

confidence: 99%

Section: Geological Setting and Section Descriptionmentioning

confidence: 99%

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Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China

et al. 2020

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“…Conodont samples used in this study came from the Schlamer #1 drillcore, Alexander County, southwestern Illinois, USA [ 32 ]. All specimens analysed were recovered from the St Clair Formation and are well preserved and thermally unaltered with a conodont colour alteration index (CAI) of 1 indicating a burial temperature no higher than 80°C [ 1 ].…”

Section: Methodsmentioning

confidence: 99%

“…The low CAI of these specimens demonstrates a very low likelihood of pyrolysis of the original organic matter in the bioapatite due to metamorphism. The St Clair Formation records the Wenlock Epoch of the Silurian Period and spans an interval from approximately 433 to 426.75 Ma [ 32 , 33 ]. Carbonate and carbonaceous shale samples from the core ranged in size from 7.5 to 15 cm in stratigraphic thickness and were digested in the University of Iowa Micropaleontology Laboratory using the standard double-buffered formic acid technique [ 34 ].…”

Section: Methodsmentioning

confidence: 99%

Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry

et al. 2020

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X-ray diffraction data from Silurian conodonts belonging to various developmental stages of the species Dapsilodus obliquicostatus demonstrate changes in crystallography and degree of nanocrystallite ordering (mosaicity) in both lamellar crown tissue and white matter. The exclusive use of a single species in this study, combined with systematic testing of each element type at multiple locations, provided insight into microstructural and crystallographic differentiation between element type ( S a , S b - c , M ) as well as between juveniles and adults. A relative increase in the unit cell dimensions a / c ratio of nanocrystallites during growth was apparent in areas demonstrating single-crystal behaviour, but no such relationship was seen in dominantly polycrystalline areas. Systematic variations in mosaicity were identified, with mosaicity (as a proxy for disorder) increasing during growth, as well as along elements from tip to base. These results provide potential insight into the integrity of conodont apatite as a recorder of palaeoseawater chemistry, as well as demonstrate the need to consider the influence of ontogeny and element type on the use of conodonts in palaeothermometry and geochemical investigations.

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Silurian (late Llandovery – Wenlock) conodont fauna and biostratigraphy from the Yanbian area of Sichuan Province, south‐west China

Yan

2021

Papers in Palaeontology

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Late Llandovery and Wenlock conodonts are still inadequately documented in China, with data collected chiefly from the Baizitian section in Yanbian County, Sichuan Province, south-west China. A collection of over 32 000 conodont elements was recovered from 38 samples from the Xiabaizitian and Shangbaizitian formations at this classic locality. The conodont fauna is dominated by cosmopolitan species and can be assigned to 50 species representing 17 genera. Of these, one new species, Apsidognathus yanbianensis sp. nov., is proposed herein. Six conodont zones are recognized in this section, including the Pterospathodus eopennatus Zone, the Pt. amorphognathoides angulatus Taxon-range Zone of the Pt. a. amorphognathoides Superzone, the Kockelella ranuliformis Zone, the Kockelella walliseri Taxon-range Zone, and the Kockelella patula Taxon-range Zone, in ascending order. These zones can be correlated with other conodont zones around the world based on the occurrences of the stratigraphically diagnostic species. Moreover, the stratigraphical ranges of Pterospathodus enable greater understanding of the correlation of the Telychian guide taxa. The conodont biodiversity changes and faunal turnover across the Silurian Ireviken Bioevent are here documented for the first time in the Baizitian section from the South China palaeoplate.

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Integrated δ13Ccarb, conodont, and graptolite biochemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision of the Bainbridge Group

Cited by 30 publications

References 46 publications

Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China

Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China

Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry

Silurian (late Llandovery – Wenlock) conodont fauna and biostratigraphy from the Yanbian area of Sichuan Province, south‐west China

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