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

V. Venkatachalapathy ¹, P. Satyanarayana Rao ²

Affiliations
1 Department of Post-Graduate studies and Research in Geology, University of Mysore, Manasa-Gangotri, Mysore, IN
2 Department of Geology, S. V. University, Tirupati, IN

Abstract

Foraminiferal samples collected during a recent study of the Upper Cretaceous-Lower Tertiary deposits of Pondicherry area, South India, have yielded a large number of individuals of Tritaxia pyramidata Reuss. A detailed morphological and microwall structural study of these shells has been made. Such a study indicates a high degree of variation in the shell and apertural shapes. Contrary to the data provided by earlier workers, the wall structure in the specimens under examination, has revealed a two layered nature, the inner layer being formed of crystals of calcite. This new investigation demands reassessment of the taxonomic status of the form. Stratigraphically, Tritaxia pyramidata appears to be a high range species, being found distributed almost throughout the above formations.

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M. N. Viswanathiah ¹, V. Venkatachalapathy ¹, A. P. Mahalakshmamma ¹

Affiliations
1 Department of Geology, University of Mysore, Manasa Gangotri, Mysore, IN

Abstract

Studies of several clastic and non-clastic sedimentary samples collected from the' Kaladgi basin have yielded 19 species classifiable into 15 genera, besides a few organic plates: Microtaennia sp., Menneria roblotae, Costatosphaerina angustata, Concentrites muricatus, Protoleiosphaeridium problematicum, Spumiosa alara, Leiosphaeridia aglutinata, L. dhakshinii, L. insigna, Protoleiosphaeridium sp., Granomarginata sp., Vavosphaeridium reticulatum, Trachysphaeridium sp. Leiovalia oblonga, Schismatosphaeridium sp. The results of investigation of these Precambrian palynofossils facilitate assignment of Precambrian-Cambrian age to the Kaladgi sediments investigated. Based on the microfossils data intertidal shallow marine depositional environment is envisaged.

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M. N. Viswanathiah ¹, V. Venkatachalapathy ¹

Affiliations
1 Department of Geology, Manasa Gangotri, Mysore, 570006, IN

Abstract

The banded ferruginous quartzites of the Bababudan hills, for the first time, after palynological probe have revealed the Occurrence of microbiota. 13 forms of specific and nonspecific taxonomic categories have been described and illustrated. Age relationships of the microbiota and the origin of the iron formation are discussed.

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Nayaz Ahmed Shareef ¹, V. Venkatachalapathy ¹

Affiliations
1 Department of Geology, University of Mysore, Manasa Gangotri, Mysore, IN

Abstract

Investigation of foraminiferal microfauna of the shore sands of Bhatkal and Devgad islands (Karnataka) , west coast of India, has facilitated recognition of 40 species from Bhatkal and 41 species from Devgad islands. A check list and illustrations for the species identified are provided. Three species are recorded for the first time from Indian waters. Based on population characteristics and distributional pattern, depositional environment and Indo-Pacific affinities of the microfauna are elucidated.

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V. Venkatachalapathy ¹, M. N. Gururaja ²

Affiliations
1 Department of Geology, University of Mysore, Mysore, IN
2 5-5-549, Mukkuramzahi Road Hyderabad, IN

Abstract

The paper records the occurrence of the red alga Aethesolithon from the Neogene limestone of LittIe Andaman Island in the Bay of Bengal. Two species of the genus are described. The new find is significant, for it is the first of its kind from Andaman area and is suggestive of its common occurrence between Andaman and Pacific regions in Miocene.

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M. N. Viswanathiah ¹, V. Venkatachalapathy ¹, Amtul Khadeer ¹

Affiliations
1 Department of Geology, University of Mysore, Manasa Gangotri, Mysore, IN

Abstract

Occurrence of a number of micro-organic remains belonging to Coccoidal nannofossils, Acritarchs and other forms is recorded from the quartz-arenites of Badami Group, Karnataka. The fossils consist of 22 taxa classifiable into the following 9 genera, besides organic plates and cells: Micrhystridium, Granomarginata, Baltisphaeridium, Lophosphaeridium, Protosphaeridium, Tasmanities, Gloeocapsamorpha, Protoleiosphaeridium and Polyedrosphaeridium.

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