1. Processes of Ferricritisation and Quaternary Sea Level Changes in the East Coast Around Madras;Achyuthan,1993
2. Geomorphic evolution and genesis of laterites around the East Coast of Madras;Achyuthan;Tamil Nadu. Geomorph.,1996
3. Age and formation of oyster beds of Muthukadu tidal flat zone, Chennai, Tamil Nadu;Achyuthan;Curr. Sci.,1997
4. Radiocarbon dates and Quaternary geomorphology of the east coast, Tamil Nadu;Achyuthan;Radiocarbon,2002
5. Quaternary stratigraphy of the Koratallaiyar-Cooum basin;Achyuthan;Chennai. J. Geol. Soc. India,2009