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

S. Kishore ¹, P. K. Mishra ¹, A. K. Jauhri ², S. K. Singh ¹, A. P. Singh ²

Affiliations
1 Department of Botany, University of Lucknow, Lucknow -226007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN

Abstract

In the present work, we bring out the palaeoenvironmental significance of the growth-form morphology of coralline algae present in the Ninniyur Formation (Palaeocene) of the Cauvery Basin, South India. Our observations indicate presence of four types of coralline algal growth forms in the studied sections of the Ninniyur Formation: laminar, branching, columnar and massive and fragmented. They seem to have been controlled by depositional environments, each characterising a distinctive set of conditions pertaining to water-energy and depth. It appears that the carbonate environment, in which the Ninniyur Formation was deposited, was well differentiated into subenvironments due to changing environmental constraints (depth of deposition and hydraulic energy). The biota responded to these factors through habitat partitioning which possibly hastened the process of evolution of varied types of coralline algal associations and growth morphology leading to distinctive biofacies characters.

Keywords

Coralline algae, Growth-forms, Palaeoenvironments, Palaeocene, Cauvery Basin, Tamil Nadu.

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H. N. Sinha ¹, P. K. Mishra ²

Affiliations
1 Department of Geology, Vinoba Bhave University, Hazaribag-825 301, IN
2 Department of Botany, Vinoba Bhave University, Hazaribag-825 301, IN

Abstract

Well preserved, though rare occurrence of Chlorophyceae algae of genus Prismocorollina sp in one of the maroon coloured silty shale microfacies from the Thango Formation reveals that the deposition sediment took place in a shallow marine in adequately oxygenated, Warm-and climatic condition during the Early Ordovician time In the Tidong valley, Kinnaur Tethyan Himalaya.

Keywords

Prismocoroelina Sp , Thango Formation, Early Ordovician, Kinnaur Tethyan Himalaya, Himachal Pradesh.

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