Presence of Miocene Oysters: Rise and Fall of a Paleo-Estuary in the East Coast of India

Riffin T. Sajeev

Abstract


Living oysters of Crassostrea Sp. are abundantly found on the east coast of peninsular India. Most of the living Crassostrea Sp. is reported from Athinkarai estuary near Mandapam. The primary object of this study is to report the occurrence of fossils of Crassostrea sp. belonging to Mio-Pliocene outcrops from an ephemeral stream channel of Thoppuvila River up to Attankarai Pallivasal, Tirunelveli dist., Tamil Nadu, India. The present study focuses on revealing the nature of a vast paleo estuary that existed on the foothills of the southern end of the Western Ghats during the Mio-Pliocene age. The authors had studied the taphonomical features of Crassostrea Gigantissima Sp. Focusing on the adaptation features like heaviness and foliated nature of shell and orientation of oyster colonies for survival. The predatory signatures on the fossil specimens indicate traces of a well flourished marine environment that resembled an estuary subjected to high energy disturbances. The chalky calcareous deposits found throughout the study area could have acted as an accelerating agent for the thick, foliated and heavy calcite shells of C. Gigantissima Sp.


Keywords


Adaptation; Crassostrea Sp.; Ichnotaxa; Mahendragiri Hills; Mio-Pliocene; Taphonomy

Full Text: PDF

Refbacks

  • There are currently no refbacks.


Bookmark and Share


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.

*2016 Journal Impact Factor was established by dividing the number of articles published in 2014 and 2015 with the number of times they are cited in 2016 based on Google Scholar, Google Search and the Microsoft Academic Search. If ‘A’ is the total number of articles published in 2014 and 2015, and ‘B’ is the number of times these articles were cited in indexed publications during 2016 then, journal impact factor = A/B. To know More: (http://en.wikipedia.org/wiki/Impact_factor)