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The Scientific World Journal
Volume 2014, Article ID 434672, 9 pages
http://dx.doi.org/10.1155/2014/434672
Research Article

Chondrites isp. Indicating Late Paleozoic Atmospheric Anoxia in Eastern Peninsular India

1Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
2Department of Geology, Hooghly Mohsin College, Chinsurah, Hooghly, West Bengal 712101, India

Received 29 August 2013; Accepted 17 November 2013; Published 30 January 2014

Academic Editors: U. Tinivella and G. Ventura

Copyright © 2014 Biplab Bhattacharya and Sudipto Banerjee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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.