Global Stratotype Section and Point for base of the Ordovician System

Cooper, Roger A.; Nowlan, Godfrey S.; Williams, S. Henry

doi:10.18814/epiiugs/2001/v24i1/005

Cited by 178 publications

(165 citation statements)

References 16 publications

(20 reference statements)

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“…The conodont community dominated by Corlylodus caboti is only recognized by cluster analysis in the Green Point section (Figs 7 & 8), where it occurs in the C. lindstromi Zone (= Iapetognathus fluctivagus Zone of Cooper et al 2001). The C. caboti community has both low species abundance and low species diversity, with the latter only ranging from one to eight (Fig.…”

Section: S Zhano and C R Barnesmentioning

confidence: 99%

“…Recently, the base of Iapetognathus #uctivagus Zone was suggested to mark such a boundary (Cooper et al 2001). In western Newfoundland, the first appearances of C. lindstromi and L preaengensis were coupled with a major increase in both conodont diversity and abundance.…”

Section: Sea-level Rise and Aerobic Conditions Leading To Community Dmentioning

confidence: 99%

“…lined in Cooper et al (2001). Despite examining many sections, the final short-list was reduced to 3reen Point in western Newfoundland, Canada, Dayangcha in Jilin Province, NE China, and Lava Dam, Utah, United States.…”

mentioning

confidence: 99%

“…Head Group in western Newfoundland, Barnes (1988) proposed that the best section to meet the criteria of a GSSP was at Green Point and provided detailed conodont data for the section, with correlations to the other sections. The final proposal for the GSSP at that locality was made by Cooper et al (2001) and approved by IUGS.…”

mentioning

confidence: 99%

“…9 The main sea-level drop occurred in the latest Cordylodus proavus Zone time and is recognized by the downslope transportation of the C. hastatus community. The main periods of sea-level rise occurred in early C. lindstromi Zone (=Iapetognathus fluctivagus Zone of Cooper et al 2001) and early C. angulatus Zone times, which are characterized by high community diversity under aerobic conditions, and the major changes within the communities under anaerobic conditions in the slope environment, respectively.…”

mentioning

confidence: 99%

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Late Cambrian and Early Ordovician conodont communities from platform and slope facies, western Newfoundland: a statistical approach

Zhang

Barnes

2004

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Twelve conodont communities and assemblages in the Cambrian-Ordovician interval of western Newfoundland are recognized by four cluster analyses, which include 18468 identifiable conodont specimens recovered from 230 conodont-bearing samples from four stratigraphic sections. Each section represents a different facies: platform, upper proximal slope, lower proximal slope, and distal slope. The 12 conodont communities and assemblages were differentiated into pelagic and nektobenthic communities as well as both the assemblages with a mixture of pelagic and nektobenthic communities and transported assemblage. The distribution of conodont communities along the platform-to-slope environmental gradient shows some gradational relationships. Relative sea-level curves derived in part from the distribution pattern of conodont communities reveal a major sea-level drop in the latest Cordylodus proavus Zone time, and two major sea-level rises in the early Iapetognathus fluctivagus Zone time and early Cordylodus angulatus Zone time, respectively.

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Section: S Zhano and C R Barnesmentioning

confidence: 99%

Section: Sea-level Rise and Aerobic Conditions Leading To Community Dmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Late Cambrian and Early Ordovician conodont communities from platform and slope facies, western Newfoundland: a statistical approach

Zhang

Barnes

2004

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Re-Os age and depositional environment for black shales from the Cambrian-Ordovician boundary, Green Point, western Newfoundland

Tripathy

Hannah

Stein

et al. 2014

Geochem. Geophys. Geosyst.

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Chemical and isotopic signatures for black shales serve as potential proxies for reconstruction of paleoenvironmental conditions. Here we bring Rock-Eval, major and trace element and Re-Os isotopic data together to examine the environmental record at the Cambrian-Ordovician Global Stratotype Section and Point (GSSP) at Green Point in western Newfoundland, Canada. The Green Point shales are oil mature and contain Type II organic material of marine origin. A Re-Os isochron for the shales provides the first radiometric age for shale deposition at the GSSP at 484 6 16 Ma, with an initial 187 Os/ 188Os ratio of 0.74 6 0.05 (Model 3 age; MSWD 5 21; n 5 13; 2r uncertainties). Factor analysis of the geochemical data set shows association of most trace elements with total organic carbon (TOC) and S contents, ensuring an authigenic origin for most elements and hence, their validity for evaluating the paleo-redox state. Relatively high-enrichment factors for redox-sensitive elements (e.g., Re, U, and Mo) compared to average shale, but comparatively low enrichment compared to modern Black Sea sediments, suggest deposition in anoxic, but not euxinic waters. Comparison of Lower Ordovician shale geochemistry data sets at a global scale leads us to suggest that anoxic conditions and warm oceanic regimes were restricted to the margins of Laurentia and Baltica, whereas depositional basins with colder waters (e.g., Avalonia and Gondwana) were less reducing. These outcomes underscore the important role of paleogeography in regulating oceanic conditions and marine life.

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References

2017

Graptolite Paleobiology

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Global Stratotype Section and Point for base of the Ordovician System

Cited by 178 publications

References 16 publications

Late Cambrian and Early Ordovician conodont communities from platform and slope facies, western Newfoundland: a statistical approach

Late Cambrian and Early Ordovician conodont communities from platform and slope facies, western Newfoundland: a statistical approach

Re-Os age and depositional environment for black shales from the Cambrian-Ordovician boundary, Green Point, western Newfoundland

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