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Chondrites isp. indicating late paleozoic atmospheric anoxia in Eastern Peninsular India.

Bhattacharya B, Banerjee S - ScientificWorldJournal (2014)

Bottom Line: Rhythmic sandstone-mudstone-coal succession of the Barakar Formation (early Permian) manifests a transition from lower braided-fluvial to upper tide-wave influenced, estuarine setting.Monospecific assemblage of marine trace fossil Chondrites isp. in contemporaneous claystone beds in the upper Barakar succession from two Gondwana basins (namely, the Raniganj Basin and the Talchir Basin) in eastern peninsular India signifies predominant marine incursion during end early Permian.Such anoxia is interpreted as intermittent falls in oxygen level in an overall decreasing atmospheric oxygenation within the late Paleozoic global oxygen-carbon dioxide fluctuations.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.

ABSTRACT
Rhythmic sandstone-mudstone-coal succession of the Barakar Formation (early Permian) manifests a transition from lower braided-fluvial to upper tide-wave influenced, estuarine setting. Monospecific assemblage of marine trace fossil Chondrites isp. in contemporaneous claystone beds in the upper Barakar succession from two Gondwana basins (namely, the Raniganj Basin and the Talchir Basin) in eastern peninsular India signifies predominant marine incursion during end early Permian. Monospecific Chondrites ichnoassemblage in different sedimentary horizons in geographically wide apart (~400 km) areas demarcates multiple short-spanned phases of anoxia in eastern India. Such anoxia is interpreted as intermittent falls in oxygen level in an overall decreasing atmospheric oxygenation within the late Paleozoic global oxygen-carbon dioxide fluctuations.

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Related in: MedlinePlus

Claystone bedding surfaces within upper Barakar succession, showing associations of Chondrites patulus (Cp), Chondrites targionii (Ct), Chondrites affinis (Ca), and Chondrites recurvus (Cr). (a) and (b) are from Kudaposi Nala, Talchir Basin, and (c) is from Khudia Nala, Raniganj Basin. Diameter of the coin is 2.3 cm in (a) and (b) and 2.5 cm in (c).
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fig6: Claystone bedding surfaces within upper Barakar succession, showing associations of Chondrites patulus (Cp), Chondrites targionii (Ct), Chondrites affinis (Ca), and Chondrites recurvus (Cr). (a) and (b) are from Kudaposi Nala, Talchir Basin, and (c) is from Khudia Nala, Raniganj Basin. Diameter of the coin is 2.3 cm in (a) and (b) and 2.5 cm in (c).

Mentions: Chondrites Sternberg is considered as an infaunal deposit-feeding system [14]. It comprises a regularly branching tunnel system consisting of a small number of master shafts open to the surface, which ramify at depth to form a dendritic network [14–17]. In the present paper, we describe four different species of Chondrites from the Barakar Formation, namely, Chondrites patulus (from Kudaposi Nala), Chondrites targionni (from both Kudaposi Nala and Khudia Nala), Chondrites affinis (from both Kudaposi Nala and Khudia Nala), and Chondrites recurvus (from Khudia Nala). In both the study sections, all the ichnoforms are hosted in fine-grained, massive claystone, mostly preserved as epichnial, sand/silt-filled ridges on the claystone bedding surfaces. The following is a description of all the ichnospecies recorded from the two areas under study.


Chondrites isp. indicating late paleozoic atmospheric anoxia in Eastern Peninsular India.

Bhattacharya B, Banerjee S - ScientificWorldJournal (2014)

Claystone bedding surfaces within upper Barakar succession, showing associations of Chondrites patulus (Cp), Chondrites targionii (Ct), Chondrites affinis (Ca), and Chondrites recurvus (Cr). (a) and (b) are from Kudaposi Nala, Talchir Basin, and (c) is from Khudia Nala, Raniganj Basin. Diameter of the coin is 2.3 cm in (a) and (b) and 2.5 cm in (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3926327&req=5

fig6: Claystone bedding surfaces within upper Barakar succession, showing associations of Chondrites patulus (Cp), Chondrites targionii (Ct), Chondrites affinis (Ca), and Chondrites recurvus (Cr). (a) and (b) are from Kudaposi Nala, Talchir Basin, and (c) is from Khudia Nala, Raniganj Basin. Diameter of the coin is 2.3 cm in (a) and (b) and 2.5 cm in (c).
Mentions: Chondrites Sternberg is considered as an infaunal deposit-feeding system [14]. It comprises a regularly branching tunnel system consisting of a small number of master shafts open to the surface, which ramify at depth to form a dendritic network [14–17]. In the present paper, we describe four different species of Chondrites from the Barakar Formation, namely, Chondrites patulus (from Kudaposi Nala), Chondrites targionni (from both Kudaposi Nala and Khudia Nala), Chondrites affinis (from both Kudaposi Nala and Khudia Nala), and Chondrites recurvus (from Khudia Nala). In both the study sections, all the ichnoforms are hosted in fine-grained, massive claystone, mostly preserved as epichnial, sand/silt-filled ridges on the claystone bedding surfaces. The following is a description of all the ichnospecies recorded from the two areas under study.

Bottom Line: Rhythmic sandstone-mudstone-coal succession of the Barakar Formation (early Permian) manifests a transition from lower braided-fluvial to upper tide-wave influenced, estuarine setting.Monospecific assemblage of marine trace fossil Chondrites isp. in contemporaneous claystone beds in the upper Barakar succession from two Gondwana basins (namely, the Raniganj Basin and the Talchir Basin) in eastern peninsular India signifies predominant marine incursion during end early Permian.Such anoxia is interpreted as intermittent falls in oxygen level in an overall decreasing atmospheric oxygenation within the late Paleozoic global oxygen-carbon dioxide fluctuations.

View Article: PubMed Central - PubMed

Affiliation: Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.

ABSTRACT
Rhythmic sandstone-mudstone-coal succession of the Barakar Formation (early Permian) manifests a transition from lower braided-fluvial to upper tide-wave influenced, estuarine setting. Monospecific assemblage of marine trace fossil Chondrites isp. in contemporaneous claystone beds in the upper Barakar succession from two Gondwana basins (namely, the Raniganj Basin and the Talchir Basin) in eastern peninsular India signifies predominant marine incursion during end early Permian. Monospecific Chondrites ichnoassemblage in different sedimentary horizons in geographically wide apart (~400 km) areas demarcates multiple short-spanned phases of anoxia in eastern India. Such anoxia is interpreted as intermittent falls in oxygen level in an overall decreasing atmospheric oxygenation within the late Paleozoic global oxygen-carbon dioxide fluctuations.

Show MeSH
Related in: MedlinePlus