Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Stratigraphy of the Penganga Group Around Adilabad, Andhra Pradesh


Affiliations
1 Geological Studies, Unit, Indian Statistical Institute, Calcutta, India
2 Department of Geological Sciences, Jadavpur University, Calcutta 700032, India
3 National Geophysical Research Institute, Hyderabad, India
     

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The Proterozoic sequence around Adilabad, Andhra Pradesh comprises a distinct lithostratigraphic unit of 'Group' status and has been given the name Penganga Group. The Penganga Group has been classified into three Formations which are, in order of younging, Pranhita Sandstone, Chanda Limestone and Sat Nala Shale. The sequence is dominated by limestones and shales which were deposited in relatively deep water environment and, thus, contrast sharply with the conglomerate, sandstone and shallow water limestones of the Pakhal Group. Radiometric dating of fresh glauconites from middle part of the Penganga Group gives an age of 770 ± 30 Ma. Thus, the Penganga Group is the youngest of all other Proterozoic sequences in Pranhita-Godavari Valley.
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  • Stratigraphy of the Penganga Group Around Adilabad, Andhra Pradesh

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Authors

Asru K. Chaudhuri
Geological Studies, Unit, Indian Statistical Institute, Calcutta, India
Somnath Dasgupta
Department of Geological Sciences, Jadavpur University, Calcutta 700032, India
Goutam Bandyopadhyay
Department of Geological Sciences, Jadavpur University, Calcutta 700032, India
Subir Sarkar
Department of Geological Sciences, Jadavpur University, Calcutta 700032, India
P. C. Bandyopadhyay
Department of Geological Sciences, Jadavpur University, Calcutta 700032, India
K. Gopalan
National Geophysical Research Institute, Hyderabad, India

Abstract


The Proterozoic sequence around Adilabad, Andhra Pradesh comprises a distinct lithostratigraphic unit of 'Group' status and has been given the name Penganga Group. The Penganga Group has been classified into three Formations which are, in order of younging, Pranhita Sandstone, Chanda Limestone and Sat Nala Shale. The sequence is dominated by limestones and shales which were deposited in relatively deep water environment and, thus, contrast sharply with the conglomerate, sandstone and shallow water limestones of the Pakhal Group. Radiometric dating of fresh glauconites from middle part of the Penganga Group gives an age of 770 ± 30 Ma. Thus, the Penganga Group is the youngest of all other Proterozoic sequences in Pranhita-Godavari Valley.