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Geological Society, London, Special Publications

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The rise and decline of the Ediacaran biota: palaeobiological and stable isotopic evidence from the NW and NE Lesser Himalaya, India

V. C. Tewari
Geological Society, London, Special Publications, 286, 77-102, 1 January 2007, https://doi.org/10.1144/SP286.6
V. C. Tewari
Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun—248001, Uttaranchal, India (e-mail: )
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Abstract

Sediments of Ediacaran age have recently been recognized in the Krol Belt (NW Lesser Himalaya, India) with the discovery of pre-Ediacaran and Ediacaran biotas, carbon isotopic excursions matching the global curve and evidence for one Neoproterozoic glacial event. Other data include evidence for termination of the Krol algal-stromatolitic carbonate cycle in Late Proterozoic and deposition of phosphorite, phosphatic stromatolites similar to Tommotian taxa, and diversification of Small Shelly Fossils (SSF) of Tommotian/Meischucunian Zone 1 in Lower Tal Formation. Recently, Riphean–Ediacaran organic-walled microfossils, stromatolites and sponge spicules (monaxon) have been recovered. The link between the decrease in microbial-induced carbonate sedimentation and the decline of large Riphean stromatolites is recorded in the inner sedimentary belt (Deoban–Gangolihat). The first appearance of complex organic-walled microfossils and acanthomorphic acritarchs is recorded in the Blaini–Infrakrol sediments along with possible Ediacaran soft-bodied metazoans and metaphytes in the Krol Formation. In India, the Late Proterozoic base occurs at the bottom of a pink, microbial limestone in the Blaini Formation, and the Precambrian–Cambrian boundary occurs somewhere in the Lower Tal Formation. Ediacaran metazoans occur above glacial deposits assigned to the Varangian/Marinoan/Blainian and below the first occurrence of SSF (Meischucunian zone I), in the lowermost Cambrian.

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Geological Society, London, Special Publications: 286 (1)
Geological Society, London, Special Publications
Volume 286
2007
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The rise and decline of the Ediacaran biota: palaeobiological and stable isotopic evidence from the NW and NE Lesser Himalaya, India

V. C. Tewari
Geological Society, London, Special Publications, 286, 77-102, 1 January 2007, https://doi.org/10.1144/SP286.6
V. C. Tewari
Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun—248001, Uttaranchal, India (e-mail: )
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The rise and decline of the Ediacaran biota: palaeobiological and stable isotopic evidence from the NW and NE Lesser Himalaya, India

V. C. Tewari
Geological Society, London, Special Publications, 286, 77-102, 1 January 2007, https://doi.org/10.1144/SP286.6
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  • Article
    • Abstract
    • The break-up of Rodinia, East Gondwana and the Lesser Himalayas
    • Secular variations in carbon isotopes, palaeobiological and biogeochemical cycles
    • Ediacaran carbon-isotope chemostratigraphy and trace element geochemistry of the Blaini–Krol–Tal sequence, Lesser Himalaya
    • Carbon and oxygen isotope chemostratigraphy and palaeobiology of the Buxa Dolomite, NE Lesser Himalaya
    • Discussion and conclusions
    • Acknowledgments
    • References
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