Geology
On the basis of Geo-tectonic considerations, Purbasthali-Nabadwip region has been undergoing steady changes since time immemorial. River course has changed many times, due to geo-tectonic movements, forming small islands and oxbow lakes over last hundreds of years. The tectonic plates here are under constant collision resulted the changes in river course. A comparative study of the Survey of India topographic sheet published in 1973 with the remote sensing images of 1989-90&1992-93 coupled with observations from recent field visits, confirms the process of formation of this vast wetland besides some small but constant changes in topography occurring every year.
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