One day a very reputed Geologist happened to visit Kanchipuram to have darshan of Mahaswamigal. After enquiring about his family Swamigal requested him to arrange for a Diver to dive and take out sand from two different locations of the River Purna (presently called River Periyar).
One location should be where the River Purna enters Kerala before it diverts into entering Kaladi and the other location should be at Kaladi itself. Later Swamigal asked him to use the technique of carbon dating to ascertain the age of the sand at these two locations.
The geologist performed the exercise as instructed by Swamigal and provided the results, which was that the sand taken from the first location yielded an age of being more than 100,000 years whereas the sand from the second location in Kaladi was close to about 2500 years!
History says that as Adi Shankara’s mother was finding it difficult to go to River Purna for Her Snanam, Adi Shankara requested the river to follow His footsteps (Kal Adi) to flow near His ancestral house.
Thus the age of the river sand at Kaladi confirmed that Adi Shankara was indeed born in the year 509 BC, which is 2500 years back! :)))
The very holy Purna river at Kaladi is seen in the picture!
Article Courtesy: Thanks to Sri Panchanathan Suresh for sharing this article in Sage of Kanchi Facebook Page.