Monday 26 October 2020

A river that was 'lost' some 172,000 years ago has been found in Rajasthan's Thar Desert

In a discovery that could shed some light on the lives of a long lost civilization centuries ago, researchers have found evidence of a "lost" river that ran through the central Thar Desert.

The river that is believed to have flown some 172 thousand years ago was found near Bikaner.

The findings, published in the journal Quaternary Science Reviews, represent the oldest directly dated phase of river activity at Nal Quarry in the central Thar Desert.

Britannica/ Representational Image

The study by researchers from The Max Planck Institute for the Science of Human History in Germany, Anna University in Tamil Nadu, and IISER Kolkata indicates that Stone Age populations lived in a distinctly different Thar Desert landscape than we encounter today.

This evidence indicates a river flowed with phases of activity dating to approximately up to 172 thousand years ago, nearby to Bikaner, Rajasthan, which is over 200 kilometres away from the nearest modern river.

These findings predate evidence for activity in modern river courses across the Thar Desert as well as dried up course of the Ghaggar-Hakra River, the researchers said.

Britannica/ Representational Image

The presence of a river running through the central Thar Desert would have offered a life-line to Paleolithic populations, and potentially an important corridor for migrations, they said.

The researchers noted that the potential importance of 'lost' rivers for earlier inhabitants of the Thar Desert have been overlooked.

"The Thar Desert has a rich prehistory, and we've been uncovering a wide range of evidence showing how Stone Age populations not only survived but thrived in these semi-arid landscapes," said Jimbob Blinkhorn from The Max Planck Institute for the Science of Human History.

"We know how important rivers can be to living in this region, but we have little detail on what river systems were like during key periods of prehistory," Blinkhorn said.

Britannica/ Representational Image

Studies of satellite imagery have shown a dense network of river channels crossing the Thar Desert, according to the researchers.

"These studies can indicate where rivers and streams have flowed in the past, but they can't tell us when," explained Professor Hema Achyuthan of Anna University.

"To demonstrate how old such channels are, we had to find evidence on the ground for river activity in the middle of the desert," Achyuthan said.

The team studied a deep deposit of river sands and gravels, which had been exposed by quarrying activity near the village of Nal.

The researchers were able to document different phases of river activity by studying the different deposits.

Britannica/ Representational Image

"We immediately saw evidence for a substantial and very active river system from the bottom of the fluvial deposits, which gradually decreased in power through time," Achyuthan said.

The results indicated that the strongest river activity at Nal occurred at approximately 172 and 140 thousand years ago, at a time when the monsoon was much weaker than today in the region.

Though it has not been established yet, there is a belief that this could be the mythical river Saraswati, for which search has been ongoing for many decades.

Though several states have claimed that they have found the tracks of the river, it has not been proven beyond doubt that these are remains of the river that was lost over 4000 years ago.

(Source: India Times)

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