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

Siddhartha Sengupta ¹

Affiliations
1 Department of Geology, Presidency College, 86/1 College Street, Calcutta - 700073, IN

Abstract

Problems of classifying the A and B Forms of reticulate Nummulites with large embryonic apparatus and intercalary whorls respectively from Early Oligocene rocks of Maniyara Fort Formation, south-western Kutch are discussed. The taxon is described and illustrated; pending further investigations, it is provisionally identified here as Nummulites cf. fichteli Michelloti.

Keywords

Foraminifera, Nummulites cf. fichteli Michelloti, Oligocene, Kutch, India.

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Siddhartha Sengupta ¹, Abhijit Chakraborty ², H. N. Bhattacharya ¹

Affiliations
1 Department of Geology, Presidency College, 86/1 College Street, Calcutta-700 073, IN
2 Departtnent of Geology, Jogamaya Devi College, Calcutta-700 026, IN

Abstract

External casts comparable with Polyplacophora (Mollusca), collected from the sand/silt-mud alternation facies (turbidite) of upper Talchir sediments of Dudhi Nala, West Bokaro basin, Hazaribagh district, Bihar are described and illustrated here for the first time. These sediments were reported to be unfossiliferous. Polyplacophoran morphology of the fossils indicate a marine link of the West Bokaro basin during the upper Talchir times. Dudhi Nala area is presently considered to be yet another locality proximal to the eastern limit of the Lower Permian marine incursion in the Indian peninsula along the Raniganj-Daltonganj-Manendragarh-Umaria belt.

Keywords

Palaeontology, Polyplacophora, Lower Permian, Talchir Sediments, Gondwana, Bihar.

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