It is well understood that the evolution of the Earth with its plurality of environmental elements is the resultant productmix of geological and biological processes coupled together. Any natural environment reflects an interactive dynamics
of mineralogy–biology–chemistry. Consequently, with temporal evolution, the milieu tends to change. Aquifers in the
deltaic Bengal basin, in eastern India and Bangladesh, offer such a process dynamics. The association of sulphate and strontium noted in the aquifers of Baruipur, West Bengal, just south of Kolkata (~ 10 km south) presents a significant evidence of invasion of sea water.