“…Most of them lack surface pitting and show minor diagenesis. Nevertheless, the conodonts are mainly opaque black, with a colour alteration index of~5 (Jing et al 2017), indicating a relatively high level of thermal influence (Epstein et al 1977). Thus, the δ 13 C carb data from the Shiyanhe Formation in the Sigang section largely preserve the original signal of perturbations in the carbon cycle, but some degree of diagenetic effects unavoidably exists.…”
Section: A Diagenetic Considerationsmentioning
confidence: 95%
“…Biostratigraphic investigations of conodonts from the Shiyanhe Formation in the Sigang section have been successively carried out since the 1980s (Pei & Cai, 1987;Liu et al 1991;Mei, 1995;Wang et al 2011;Jing et al 2017). However, the conodont biostratigraphic frameworks proposed by Pei & Cai (1987), Liu et al (1991) and Mei (1995) are somewhat contradictory, which made the correlation of the Shiyanhe Formation debatable (Rong et al 2015;Jing et al 2017). In order to provide a precise relative age for the Shiyanhe Formation, Jing et al (2017) reassessed the conodont biostratigraphy based on a collection of more than 8800 identified conodont specimens from the Sigang section.…”
Section: Lithostratigraphy and Biostratigraphymentioning
confidence: 99%
“…However, the conodont biostratigraphic frameworks proposed by Pei & Cai (1987), Liu et al (1991) and Mei (1995) are somewhat contradictory, which made the correlation of the Shiyanhe Formation debatable (Rong et al 2015;Jing et al 2017). In order to provide a precise relative age for the Shiyanhe Formation, Jing et al (2017) reassessed the conodont biostratigraphy based on a collection of more than 8800 identified conodont specimens from the Sigang section. The biozonal succession introduced by Jing et al (2017) comprises, in upward order, the Oulodus ulrichi Biozone, the Oulodus robustus Biozone, the Aphelognathus grandis Biozone and the Aphelognathus divergens Biozone.…”
Section: Lithostratigraphy and Biostratigraphymentioning
confidence: 99%
“…1a) is the exception to the lack of Katian carbonate-dominated strata within China, and here calcareous facies in platform setting of midlate Katian age are extensively developed. The Shiyanhe Formation in the Neixiang area represents the most stratigraphically continuous middle to late Katian carbonate succession in China (Rong et al 2015;Jing et al 2017). Therefore, the Shiyanhe Formation is considered suitable for assessing the middle to late Katian δ 13 C chemostratigraphy.…”
The Katian (Upper Ordovician) Shiyanhe Formation at the Sigang section, Neixiang area, Henan Province, central China, has been investigated for carbon isotope (δ13Ccarb) chemostratigraphy. The carbon isotopic data document signal between the two major Ordovician positive shifts in δ13C, the early Katian Guttenberg and the Hirnantian excursions. The Kope (Ka1/2), Fairview (Ka2/3), Waynesville (Ka3/4), Whitewater (Ka4) excursions and a doubtful Elkhorn (Ka4) excursion are identified herein. The continuous and well-defined conodont zonal succession of the Sigang section provides a secure biostratigraphic framework for the mid-late Katian carbon isotope chemostratigraphy in China. Correlation between carbon-isotope data curve and the relative sea-level changes shows no clear correspondence, and hence the sea-level change is probably not the main driver of δ13C excursions during the Katian. Intercontinentally, the mid–late Katian carbon isotope excursions, identified mainly in the North American and Baltoscandian successions, are useful for improving long-distance stratigraphic correlations. This further suggests that these excursions represent global perturbations in the carbon cycle.
“…Most of them lack surface pitting and show minor diagenesis. Nevertheless, the conodonts are mainly opaque black, with a colour alteration index of~5 (Jing et al 2017), indicating a relatively high level of thermal influence (Epstein et al 1977). Thus, the δ 13 C carb data from the Shiyanhe Formation in the Sigang section largely preserve the original signal of perturbations in the carbon cycle, but some degree of diagenetic effects unavoidably exists.…”
Section: A Diagenetic Considerationsmentioning
confidence: 95%
“…Biostratigraphic investigations of conodonts from the Shiyanhe Formation in the Sigang section have been successively carried out since the 1980s (Pei & Cai, 1987;Liu et al 1991;Mei, 1995;Wang et al 2011;Jing et al 2017). However, the conodont biostratigraphic frameworks proposed by Pei & Cai (1987), Liu et al (1991) and Mei (1995) are somewhat contradictory, which made the correlation of the Shiyanhe Formation debatable (Rong et al 2015;Jing et al 2017). In order to provide a precise relative age for the Shiyanhe Formation, Jing et al (2017) reassessed the conodont biostratigraphy based on a collection of more than 8800 identified conodont specimens from the Sigang section.…”
Section: Lithostratigraphy and Biostratigraphymentioning
confidence: 99%
“…However, the conodont biostratigraphic frameworks proposed by Pei & Cai (1987), Liu et al (1991) and Mei (1995) are somewhat contradictory, which made the correlation of the Shiyanhe Formation debatable (Rong et al 2015;Jing et al 2017). In order to provide a precise relative age for the Shiyanhe Formation, Jing et al (2017) reassessed the conodont biostratigraphy based on a collection of more than 8800 identified conodont specimens from the Sigang section. The biozonal succession introduced by Jing et al (2017) comprises, in upward order, the Oulodus ulrichi Biozone, the Oulodus robustus Biozone, the Aphelognathus grandis Biozone and the Aphelognathus divergens Biozone.…”
Section: Lithostratigraphy and Biostratigraphymentioning
confidence: 99%
“…1a) is the exception to the lack of Katian carbonate-dominated strata within China, and here calcareous facies in platform setting of midlate Katian age are extensively developed. The Shiyanhe Formation in the Neixiang area represents the most stratigraphically continuous middle to late Katian carbonate succession in China (Rong et al 2015;Jing et al 2017). Therefore, the Shiyanhe Formation is considered suitable for assessing the middle to late Katian δ 13 C chemostratigraphy.…”
The Katian (Upper Ordovician) Shiyanhe Formation at the Sigang section, Neixiang area, Henan Province, central China, has been investigated for carbon isotope (δ13Ccarb) chemostratigraphy. The carbon isotopic data document signal between the two major Ordovician positive shifts in δ13C, the early Katian Guttenberg and the Hirnantian excursions. The Kope (Ka1/2), Fairview (Ka2/3), Waynesville (Ka3/4), Whitewater (Ka4) excursions and a doubtful Elkhorn (Ka4) excursion are identified herein. The continuous and well-defined conodont zonal succession of the Sigang section provides a secure biostratigraphic framework for the mid-late Katian carbon isotope chemostratigraphy in China. Correlation between carbon-isotope data curve and the relative sea-level changes shows no clear correspondence, and hence the sea-level change is probably not the main driver of δ13C excursions during the Katian. Intercontinentally, the mid–late Katian carbon isotope excursions, identified mainly in the North American and Baltoscandian successions, are useful for improving long-distance stratigraphic correlations. This further suggests that these excursions represent global perturbations in the carbon cycle.
“…1). This region is part of the eastern Qinling orogenic belt, which formed the northern margin of the South China paleoplate (Rong et al, 2015; Jing et al, 2017) located in the equatorial region during the Late Ordovician (Torsvik and Cocks, 2017). Figure 1.Generalized map of central China and studied region in southwestern Henan, modified from Zhang et al (2019a).…”
An example of parasitic drilling in a rhynchonelliform brachiopod is described from the Shiyanhe Formation (Katian, Upper Ordovician) of Henan, central China. The boring extends into the shell almost perpendicular to the surface. The shell has been serially sectioned, and the trace (including boring and bioclaustration) has been modeled in three dimensions. Healing of the shell evident in serial sections supports a long-term relationship between the brachiopod and borer that we interpret as parasitic. Platyceratid gastropods, found at the same locality as these brachiopods, are the most likely drilling organism. Previous reports of Paleozoic brachiopod parasitic traces can be classified into two main groups, constructive association and destructive association, depending on whether parasites damage brachiopod shells. The example in this study belongs to the second type as the brachiopod shell has been partly damaged by the borer.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
