Study and Use of Upper Cambrian to Lower Ordovician conodonts in central, southern, and western Laurentia, 1933–2018

Miller, James F.

doi:10.1007/s12549-019-00380-9

Cited by 8 publications

(9 citation statements)

References 49 publications

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“…Terfelt et al (2012) reported Iapetognathus fluctivagus to have its LO above that of planktonic graptolites at the Green Point section. Miller et al (2014) rejected the taxonomic judgements of Terfelt et al (2012), but Miller (2020 noted that Iapetognathus fluctivagus had been recorded previously in Bed 22 at Green Point (Miller and Taylor, 1995, p. 109;Nicoll et al, 1999b, Table 2, item 19), extending its range below the level of the GSSP. There are also concerns about substantial reworking of Cambrian conodonts near the level of the GSSP at Green Point (Miller, 2020).…”

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 94%

“…Miller et al (2014) rejected the taxonomic judgements of Terfelt et al (2012), but Miller (2020 noted that Iapetognathus fluctivagus had been recorded previously in Bed 22 at Green Point (Miller and Taylor, 1995, p. 109;Nicoll et al, 1999b, Table 2, item 19), extending its range below the level of the GSSP. There are also concerns about substantial reworking of Cambrian conodonts near the level of the GSSP at Green Point (Miller, 2020). A detailed study of the GSSP interval shows a significant geochemical anomaly in the middle of Bed 22 (Azmy et al, 2014(Azmy et al, , 2015, suggesting that this horizon, about 2.5 m below the GSSP, would be a better position for it.…”

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 94%

“…Auxiliary Stratotype Section and Point (ASSP) -a preferred term for an Auxiliary Stratotype Point according to Fernández-López et al (2009). Auxiliary boundary Stratotype Section and Point (ASSP) (e.g., Ergaliev et al, 2014;Miller et al, 2015bMiller et al, , 2020Wang et al, 2021;Figs. 1, 4b).…”

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 99%

“…1, 4b). Auxiliary boundary Stratigraphic Section and Point (ASSP) (Miller et al, 2015a(Miller et al, , 2015b(Miller et al, , 2020. Auxiliary Global Stratotype Section and Point (ASSP) (Ma et al, 2021).…”

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 99%

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The Standard Auxiliary Boundary Stratotype: a proposed replacement for the Auxiliary Stratotype Point in supporting a Global boundary Stratotype Section and Point (GSSP)

et al. 2023

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Auxiliary boundary stratotypes have unquestionable value in extending the knowledge of a Global boundary Stratotype Section and Point (GSSP) between continents, biogeographic provinces, climatic zones, depositional facies and preservational states. Two kinds of such stratotypes are in use, the Auxiliary Stratotype Point and the Auxiliary Stratotype Section, although only the Auxiliary Stratotype Point is recognised by the International Commission on Stratigraphy (ICS). The Standard Auxiliary Boundary Stratotype, which is based on the Auxiliary Stratotype Section, is proposed here as a formal replacement for the Auxiliary Stratotype Point. As such, it would provide a detailed complementary expression of the boundary interval without the designation of a specific point -no such points can replicate the precise level defined by a GSSP either conceptually or in practice. We recommend that requirements for future Standard Auxiliary Boundary Stratotypes broadly follow ICS guidelines for GSSPs but be applied with greater flexibility. Past practice reveals inconsistency in the protocols used for approving such auxiliary boundary stratotypes. We propose that in future they require approval by the respective ICS subcommission. More than one Standard Auxiliary Boundary Stratotype may support a single GSSP but restraint should be exercised in approving them, and each will always be subordinate to the GSSP itself.

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Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 94%

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 94%

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 99%

Section: Ordovician Gssp and Auxiliary Boundary Stratotype Sections A...mentioning

confidence: 99%

See 2 more Smart Citations

The Standard Auxiliary Boundary Stratotype: a proposed replacement for the Auxiliary Stratotype Point in supporting a Global boundary Stratotype Section and Point (GSSP)

et al. 2023

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“…The correlation and match of the Xiaoyangqiao ASSP section to the Green Point GSSP section (Cooper et al, 2001;Wang et al, 2019), the Lawson Cove ASSP section (Miller et al, 2015(Miller et al, , 2019 and the Wa'ergang Section, Hunan, South China (Dong and Zhang, 2017) is shown in Fig. 13.…”

Section: Summary Of Correlationmentioning

confidence: 99%

The Xiaoyangqiao section, Dayangcha, North China: the new global Auxiliary Boundary Stratotype Section and Point (ASSP) for the base of the Ordovician System

et al. 2021

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In 2019 the Sub-Commission on the Ordovician System approved the Xiaoyangqiao section, North China as a new ASSP section for the base of the Ordovician System. The sedimentary succession of the section is exposed in a natural outcrop near the Dayangcha Village at a position of 42°3'24''N, 126°42'21''E. It has a well-preserved, abundant and diverse fossil record across the boundary with key markers (conodonts and graptolites), which provide improved intercontinental correlation of the Cambrian-Ordovician boundary. The appearance of the first planktonic graptolites is immediately below the base of the Cordylodus lindstromi Conodont Zone. Other fossils, including acritarchs, brachiopods and trilobites are also present in the Xiaoyangqiao ASSP section. Non-biotic secondary global markers near the base of the Ordovician System include a positive carbon isotopic excursion with the maximum peak (named HSS) below the boundary, a prominent unnamed negative peak immediately below the boundary and a prominent carbon isotope excursion with positive peaks above the boundary. The latter excursion is associated with the appearance of the planktonic graptolites in the Ordovician. The strength of the Xiaoyangqiao ASSP section is the correlation between the conodonts and graptolites, correspondence of sea-level lowstands, and the matches of geochemical parameters.

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Upper Cambrian and lower Ordovician conodont and carbon isotope bio-chemostratigraphy of the eastern North China Platform: Implications for global correlation and palaeoenvironments

Chen,

Yang,

et al. 2024

Journal of Asian Earth Sciences

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Study and Use of Upper Cambrian to Lower Ordovician conodonts in central, southern, and western Laurentia, 1933–2018

Cited by 8 publications

References 49 publications

The Standard Auxiliary Boundary Stratotype: a proposed replacement for the Auxiliary Stratotype Point in supporting a Global boundary Stratotype Section and Point (GSSP)

The Standard Auxiliary Boundary Stratotype: a proposed replacement for the Auxiliary Stratotype Point in supporting a Global boundary Stratotype Section and Point (GSSP)

The Xiaoyangqiao section, Dayangcha, North China: the new global Auxiliary Boundary Stratotype Section and Point (ASSP) for the base of the Ordovician System

Upper Cambrian and lower Ordovician conodont and carbon isotope bio-chemostratigraphy of the eastern North China Platform: Implications for global correlation and palaeoenvironments

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