Early Permian macroinvertebrate assemblages from the Siang and Subansiri districts, Arunachal Pradesh: Implications on the regional stratigraphy, palaeoenvironment, palaeoecology, and palaeobiogeography

Mondal, Subhronil; Mukherjee, Debahuti; Iangrai, Bashisha; Roy, Arindam; Sinha, Subhajit

doi:10.1007/s12040-021-01569-3

Cited by 4 publications

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“…(Pascoe, 1968; Mukhopadhyay et al 2010; Varshney & Bhattacharya, 2023). Marine fossil assemblages have been recorded from several basins in Peninsular India where the Talchir Formation crops out, as well as along the Tethyan margin (Venkatachala & Tiwari, 1987; Ghosh, 2003; Mukhopadhyay et al 2010; Bharti & Chakraborty, 2014; Mondal et al 2021). However, supposedly glacial sediments and Early Permian marine fossils together occur nowhere in India except in the study area near Manendragarh (Bose et al 1992; 1997; Chakraborty, 1993; Mukhopadhyay & Bhattacharya, 1994; Bhattacharya et al 2004; Bhattacharya & Bhattacharya, 2015; Varshney & Bhattacharya, 2023).…”

Section: Late Palaeozoic Glaciation In Gondwanamentioning

confidence: 99%

Glacial sedimentation in Northern Gondwana: insights from the Talchir formation, Manendragarh, India

et al. 2023

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Among the vast swathes of Gondwanan sedimentary rocks in India, exposures of the Lower Permian Talchir Formation at Manendragarh in India are exceptional for their cold marine faunal assemblage and muddy conglomerates of possible glacial origin. They may represent a record of the late Palaeozoic glaciation that affected Gondwana in the Permo-Carboniferous. Although the fossil record is relatively well documented, the sedimentology of this area is not well understood. This paper intends to fill the gap in knowledge regarding palaeogeography and the palaeoenvironmental changes within the basin through space and time. We distinguish conglomerates that are formed by glacial and mass flow processes. The lateral variation in facies associations along a NNE-SSW transect in the study area identifies the depositional basin as an interior sea that formed when the sea spilled over a steep basement ridge during a transgression. The benthic organisms remained confined to the seaward basin margin where they only flourished in the initial stage of basin filling. Locally derived, bioclastic storm beds are limited to the seaward flank of the basin. Alternating phases of glaciation and interglaciation resulted in an interbedded succession of grey shales and interglacial density flow deposits. The channels that fed these density flows are preserved closest to the landward margin of the basin. Co-existence of glacial diamictites and interglacial density flow deposits highlights the climatic changes in this part of Gondwana during the Late Palaeozoic.

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