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Authors
Affiliations
1 Department of Botany, University of Lucknow, Lucknow -226007, IN
2 Department of Geology, University of Lucknow, Lucknow - 226 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1293-1297
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.
