Middle–Upper Ordovician conodonts from the Gunningbland area in central New South Wales with implications for regional correlations DOI
Yong Yi Zhen, Ian G. Percival, Patrick M. Smith

et al.

Australian Journal of Earth Sciences, Journal Year: 2023, Volume and Issue: 70(6), P. 815 - 839

Published: June 22, 2023

This study documents Middle to Late Ordovician conodont faunas primarily from the Billabong Creek Formation exposed in Gunningbland area located west of Parkes and northwest Forbes central New South Wales. Forty-four identifiable species recovered 105 limestone samples this form basis most complete biostratigraphic succession shallow-water facies known through interval Australia. Four biozones are recognised, extending middle Darriwilian Histiodella holodentata–Eoplacognathus pseudoplanus Eoplacognathus suecicus biozones, upper Pygodus serra Biozone, anserinus Biozone spanning uppermost basal Sandbian interval. A lower carbonate gap coincides with an unzoned interval, followed by successively younger Belodina compressa, Phragmodus undatus Taoqupognathus blandus Katian. The T. directly correlates detailed biozonation established Katian limestones Molong Volcanic Belt further east. These age determinations provide much improved precision for correlation within Phases 2 3 mineral-rich Macquarie Province. Analysis biofacies data supports enhanced understanding geological evolution Province interpreting interplay between volcanic activity deposition.KEY POINTSConodont studies reveal only Australia that extends continuously Sandbian.Three (late early Katian) correlate precisely carbonates east.Revised stratigraphic definitions formations provided.

Language: Английский

First coral from the Katian (Upper Ordovician) dolostones of the western Yangtze Platform in South China DOI
Guangxu Wang, Xin Wei

Alcheringa An Australasian Journal of Palaeontology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 7

Published: Feb. 23, 2025

Language: Английский

Citations

0
Ordovician integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas DOI Open Access
Xiang Fang, Yong Yi Zhen, Guangxu Wang

et al.

Science China Earth Sciences, Journal Year: 2024, Volume and Issue: 67(4), P. 971 - 1004

Published: March 20, 2024

Language: Английский

Citations

3
Marine eutrophication within the Tarim Platform in sync with Middle to Late Ordovician climatic cooling DOI
Junpeng Zhang, Wenjie Li, Xiang Fang

et al.

Journal of the Geological Society, Journal Year: 2024, Volume and Issue: 181(2)

Published: Jan. 24, 2024

Previous work has proposed climatic cooling and atmosphere–ocean oxygenation as potential triggers for the Great Ordovician Biodiversification Event, with suggestion of better oxygenated oceans during Middle to Late Ordovician. However, recent studies have argued spatial temporal heterogeneity in marine redox state on several continents. Here we investigate a black-shale succession accumulated within Tarim Platform via combination geochemical proxies address these debates. Negative shifts bulk nitrogen isotopes synchronous increases excess phosphorus suggest moderate-high primary production coinciding development bottom-water anoxia, indicated by enrichments highly reactive iron modest concentrations redox-sensitive trace metals (Mo, U). Moreover, occurrence black shale correlates well equivalent successions formed deep-water marginal basins along continents, including South China, North Laurentia Baltica. This may an expansion anoxia low-latitude zones late Darriwilian early Sandbian oceans, probably result enhanced upwelling sync cooling. The extent ultimate cause requires further quantifying constraints at global scale, which will enable links between oceanic conditions concurrent biotic changes be evaluated more detail. Supplementary material: Geochemical dataset Dawangou section (Table S1) is available https://doi.org/10.6084/m9.figshare.c.7036552 Thematic collection: article part Chemical Evolution Mid-Paleozoic Earth System Biotic Response collection at: https://www.lyellcollection.org/topic/collections/chemical-evolution-of-the-mid-paleozoic-earth-system

Language: Английский

Citations

1
Locomotory and morphological evolution of the earliest Silurian graptolite Demirastrites selected by hydrodynamics DOI

Gao Shijia,

Jingqiang Tan, Wenhui Wang

et al.

Palaeontology, Journal Year: 2024, Volume and Issue: 67(3)

Published: May 1, 2024

Abstract Interpretation of the locomotion biostratigraphically important graptolite taxa is rare, and rendered problematic due to a lack close modern analogues soft tissues. In this study, based on well‐preserved specimens early Silurian low‐helical spiral Demirastrites Eisel, we reconstructed three‐dimensional models simulated their using computational fluid dynamics. Hydrodynamic properties (outer‐wall pressure fields velocity fields) were obtained used test prevailing hypothesis that low helical could rotate in seawater. The kept rotating at different velocities simulation field, which helped counteract impact water current achieve stability. During rotation, higher be observed near thecal apertures, meant better access more nutrient particles sea water. Our thus confirmed locomotory pattern conical for purpose feeding efficiency tubarium Moreover, analysed how evolution structural innovations, such as density width thecae angle proximal curvature within recovered geological lineages , influenced selected by hydrodynamics. results showed evolved towards increased stability rotation velocity. study highlights importance hydrodynamic constraints serving hidden abiotic factors shaping planktonic graptolites.

Language: Английский

Citations

1
A journey through the Ordovician System around the world DOI
Thomas Servais, David A. T. Harper, Bertrand Lefèbvre

et al.

Geological Society London Special Publications, Journal Year: 2023, Volume and Issue: 533(1), P. 1 - 10

Published: Feb. 10, 2023

Abstract The Ordovician was a key period in the biological and geological history of Earth. ‘A Global Synthesis System’ is presented two volumes Geological Society, Special Publications series. first volume (SP532) covers general aspects also includes syntheses successions Europe. To provide comprehensive global overview, this second (SP533) represents journey through System around world. Reviews North America include Alaska, Greenland, Canada, USA Mexico, whereas South American summarized specific chapter related to Argentina neighbouring countries. Africa chapters covering north south continent where significant occur. Australia New Zealand, as well Antarctica, are visited separate chapters. Asia provides most complex that reviewed Turkey Levant region, Middle East, Central Asia, Kazakhstan, India, SE China, Korea, Japan. Our great number locations but, with many still be fully described, our knowledge world remains incomplete.

Language: Английский

Citations

1
青藏高原及其周边奥陶纪综合地层、古生物群与古地理演化 DOI Open Access

翔 方,

勇毅 甄,

光旭 王

et al.

SCIENTIA SINICA Terrae, Journal Year: 2023, Volume and Issue: unknown

Published: Sept. 5, 2023

Citations

1
Middle–Upper Ordovician conodonts from the Gunningbland area in central New South Wales with implications for regional correlations DOI
Yong Yi Zhen, Ian G. Percival, Patrick M. Smith

et al.

Australian Journal of Earth Sciences, Journal Year: 2023, Volume and Issue: 70(6), P. 815 - 839

Published: June 22, 2023

This study documents Middle to Late Ordovician conodont faunas primarily from the Billabong Creek Formation exposed in Gunningbland area located west of Parkes and northwest Forbes central New South Wales. Forty-four identifiable species recovered 105 limestone samples this form basis most complete biostratigraphic succession shallow-water facies known through interval Australia. Four biozones are recognised, extending middle Darriwilian Histiodella holodentata–Eoplacognathus pseudoplanus Eoplacognathus suecicus biozones, upper Pygodus serra Biozone, anserinus Biozone spanning uppermost basal Sandbian interval. A lower carbonate gap coincides with an unzoned interval, followed by successively younger Belodina compressa, Phragmodus undatus Taoqupognathus blandus Katian. The T. directly correlates detailed biozonation established Katian limestones Molong Volcanic Belt further east. These age determinations provide much improved precision for correlation within Phases 2 3 mineral-rich Macquarie Province. Analysis biofacies data supports enhanced understanding geological evolution Province interpreting interplay between volcanic activity deposition.KEY POINTSConodont studies reveal only Australia that extends continuously Sandbian.Three (late early Katian) correlate precisely carbonates east.Revised stratigraphic definitions formations provided.

Language: Английский

Citations

0