A good number of Palaeocene-Eocene LBF taxa are reported mostly from the East-Coast sedimentary basins as well as Rajasthan Basins in India. Many of these genera / species have considerable index marker value in the stratigraphy and need to be defined on precise quantitative criteria in order to limit their morphological variation, thus making them more useful for finer stratigraphy. This will also open-up understanding their phylogenetic relationship through geological time. Initially genera like Laffetina, Lockhartia, Sakesaria, Ranikothalia and others may be taken up for the studies.
I want to believe that the discussion raised seeks to emphasize the need for erecting precise criteria to serve as marker units or stratigraphic horizons based on the abundance of complete absence of certain taxa; and therefore find usefulness in regional correlation schemes. Such criteria should be based on peculiarity of the tools used, if they are fossils markers, are they having the characteristics of guide fossils; if they are geochemical marker, could they be tied to known global geochemical perturbations eg the layer of iridium across the K-T boundary, suggests some control to the hypothesis of the extraterrestrial asteroid impact on the earth that led to the demise of the dinosaurs, etc. I suspect discussions along these lines and their suitability for application is the intent of this discussion raised.
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