Occurrence of Arc t ostrea: Existence of high energy Paleoenvironment in Cauvery basin, India during Late Cretaceous .
The distribution of ammonites in Arogyapuram/Dalmiapuram, Ariyalur and Senthurai areas show a maximum abundance at Ariyalur and a decrease in its abundance from Ariyalur around 30-35 Km. An uplift which caused marine regression throughout Cauvery basin was proposed by earlier workers. In the present study author propose a terrain style at Cauvery basin with respect to Senthurai, Ariyalur and Dalmiapuram in early Cretaceous and after uplift in late Cretaceous. Hence the possibility of a shallow water basin in Dalmiapuram and senthurai regions cannot be ruled out. If it happens , there is enough chance to create a very deep canyon like terrain and water from both sides of Ariyalur accumulated in that region with a depth of more than 100 m. This favors the migration of ammonites from Dalmiapuram and Senthurai regions to Ariyalur region.
More than 30 samples of Arctostrea were collected by the author, The Rastellum (Arctostrea) genus in cavery basin may have originated in late Jurassic with adaptive modifications like high toothed commissure. The reason for such adaptation is the existence of high energy environment with heavy sedimentation. Arctostrea, comprising strongly elongated, slender, arcuate forms with high zigzag commissure were dominant during this time. These genera differ in their morphology of features externally and internally, but some representatives of genus Alectryonia (e.g., Al. rastellaris or Al. gregarea) are elongated and arched. Probably the Arctostrea originated from such forms.
Key Words : Cauvery Basin, Arcostrea , Cretaceous, Alectryonia, Ammonite, Al. rastellaris, ,Arogyapuram, Ariyalur
- 1. Armstrong-Altrin, J.S., Verma, S.P., Madhavaraju, J., Lee, Y.I., Ramasamy,
- 10. Krishnan Ayyasami, Role of oysters in biostratigraphy: A case study from the Cretaceous of the Ariyalur area, southern India, Geosciences Journal Vol. 10, No. 3, p. 237 − 247, September 2006
- 11. Liu, Y.G., Miah, M.R.U., Schmitt, R.A., 1988, Cerium: a chemical tracer for paleo-oceanic redox conditions: Geochimica et Cosmochimica Acta, 52, 1361-1371
- 12. Matthew P. Watkinson, Malcolm B. Hart and Archana Joshi : Cretaceous tectonostratigraphy and the development of the Cauvery Basin, southeast India ,Petroleum Geoscience; May 2007; v. 13; no. 2; p. 181-191
- 13. Madhavaraju, J., Ramasamy, S., 1999a, Rare earth elements in limestones of Kallankurichchi Formation of Ariyalur Group, Tiruchirapalli Cretaceous, Tamil Nadu: Journal of the Geological Society of India, 54, 291-301
- 14. Madhavaraju, J., Lee, Y.I., 2009, Geochemistry of the Dalmiapuram Formation of the Uttatur Group (Early Cretaceous), Cauvery basin, southeastern India: Implications on provenance and paleo-redox conditions: Revista Mexicana de Ciencias Geológicas, v. 26, núm. 2, p. 380-394.
- 15. M. D. Geraghty and G. E. G. Westermann, Palaon.Z, 68,3/4,473-490,Stuttgart, September,1994.
- 16. Murray, R.W., Ten Brink, M.R.B., Brumsack, H.J., Gerlach, D.C., Russ III, G.P., 1991a, Rare earth elements in Japan Sea sediments and diagenetic behaviour of Ce/Ce*: Results from ODP Leg 127: Geochimica et Cosmochimica Acta, 55, 2453-2466.
- 2. Banerji, R.K., 1972, Stratigraphy and micropalaeontology of the Cauvery Basin, Part-I, exposed area: Journal of Paleontological Society of India, 17, 1-24.
- 3. De Baar, H.J.W., German, C.G., Elderfield, H., Van-Gaans, P., 1988, Rare earth elements distributions in anoxic waters of the Cariaco Trench: Geochimica et Cosmochimica Acta, 52, 1203-1219.
- 4. Elderfield, H., Upstill-Goddard, R., Sholkovitz, E.R., 1990, The rare earth
- 5. Elderfield, H., 1988, The oceanic chemistry of the rare earth elements: Philosophical Transactions of the Royal Society of London, 325, 105-106.
- 6. Govindan, A., Ananthanarayanan, S. & Vijayalakshmi, K.G., 2000. Cretaceous petroleum system in Cauvery basin, India. In: Govindan, A. (ed.), Cretaceous stratigraphy – An update. Memoirs of the Geological Society of India, 46: 365–382. Geological Society of India, 46: 213–227.
- 7. German, C.R., Elderfield, H., 1990, Application of Ce anomaly as a paleo redox indicator: the ground rules: Paleoceanography, 5, 823-833.
- 8. Halina Pugaczewska,Jurassic Ostridae of Poland, Acta Paleontologica Polonica, Vol. XVI, 1971
- 9. Kale, A.S., Lotfalikhani, A. & Phansalkar, V.G., 2000. Calcareous nannofossils from the Uttatur Group of Trichinopoly Cretaceous, South India. In: Govindan, A. (ed.), Cretaceous stratigraphy– An update. Memoirs of the Geological Society of India, 46: 365–382. Geological Society of India
- S., 2003, Geochemistry of Late Miocene Kudankulam Limestones, South India: International Geology Review, 45, 16-26.
- elements in rivers, estuaries and coastal seas and their significance to the composition of ocean waters: Geochimica et Cosmochimica Acta, 54, 971-991.
No one has provided updates yet.