Scientists discover new 'Meghalayan age' in Earth's history
London, July 18: Geologists have classified the last 4,200 years as being a distinct Earth age and are calling it a new chapter -- the "Meghalayan Age" -- the onset of which was marked by a mega-drought that crushed a number of civilizations worldwide.
The new classification came about after stalagmites on the floors of caves in the northeastern Indian state of Meghalaya were discovered that were considered as a significant proof for the latest distinction, the BBC reported on Wednesday.
Earth's existence of 4.6-billion-year is divided into slices of time. Each slice corresponded to significant happenings -- such as the break-up of continents, dramatic shifts in climate, and even the emergence of particular types of animals and plant life.
The current age in which we live is called the Holocene Epoch, which reflects everything that has happened over the past 11,700 years -- since a dramatic warming kicked us out of the last ice age, the BBC reported.
But the Holocene itself can be subdivided, according to the International Commission on Stratigraphy (ICS).
The ICS is the official keeper of geologic time and it proposed three stages be introduced to denote the epoch's upper, middle and lower phases. These all record major climate events.
The Meghalayan, the youngest stage, runs from 4,200 years ago to 1950. It began with a destructive drought, whose effects lasted two centuries, and severely disrupted civilizations in Egypt, Greece, Syria, Palestine, Mesopotamia, the Indus Valley and the Yangtze River Valley, the BBC report added.
To win the classification, a slice of geological time generally has to reflect something whose effects were global in extent and be associated with a rock or sediment type that is clear and unambiguous.
For the famous boundary 66 million years ago that marks the switch in period from the Cretaceous to Tertiary, this "golden spike" is represented by traces in sediments of the element iridium. This was spread across the planet in the debris scattered by the asteroid that wiped out the dinosaurs.
For the Meghalayan, the spike is epitomized in specific chemical signatures, the finest example of which can be seen in the layers of stalagmites on the floors of caves in the northeastern Indian state of Meghalaya.
It was likely triggered by shifts in ocean and atmospheric circulation, the ICS said.
The Meghalayan Age is unique among the many intervals of the geologic timescale. Its beginning coincides with a global cultural event produced by a global climatic event, said Stanley Finney, Professor at Long Beach State University and Secretary-General of the International Union of Geological Sciences (IUGS), which ratified the ICS proposal.
The middle phase of the Holocene will be referred to as the Northgrippian, and runs from 8,300 years ago up to the start of the Meghalayan. The onset for this age was an abrupt cooling, attributed to vast volumes of freshwater from melting glaciers in Canada running into the North Atlantic and disrupting ocean currents.
The oldest phase of the Holocene -- the exit from the ice age -- will be known as the Greenlandian. The International Chronostratigraphic Chart, the famous diagram depicting the timeline for Earth's history will be updated, the BBC reported.
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Rohit identifies Arshdeep, Hardik as key to India's chances in T20 World Cup
New Delhi (PTI): T20 World Cup-winning captain Rohit Sharma reckons all-rounder Hardik Pandya and left-arm seamer Arshdeep Singh will hold the key to India's prospects in the upcoming edition of the tournament.
Defending champions India will enter the T20 showpiece as one of the overwhelming favourites due to their massive depth and quality.
Rohit highlighted Arshdeep's effectiveness with the new ball and at the death.
"It is a big positive to have both Jasprit Bumrah and Arshdeep Singh together because they always attack for wickets. Arshdeep's biggest strength is swinging the new ball and taking early wickets. He mainly bowls with the new ball and at the death. Starting and finishing are the most important phases, and he is strong in both," Rohit told JioHotstar.
"With the new ball, he swings it to get left-handers caught in the slips and targets the pads of right-handers. He has also started taking the ball away from right-handers. These skills are key for a new-ball bowler. He always tries to take wickets, which is why he bowls the first over."
Rohit added, "In the 2024 T20 World Cup final against South Africa, he did a great job. I still remember he dismissed Quinton de Kock when he was set and batting well. In the 19th over, he gave away just two or three runs, which built pressure on the South Africans.
"That is his game, bowling with the new ball and at the death, and he will play a key role for India in the 2026 T20 World Cup."
India won the last edition of the tournament in the Americas under Rohit's captaincy, after which the dashing opener retired from the T20 format internationally.
Rohit also spoke about how Hardik's dual role as a finisher and multi-phase bowler provides crucial balance to the Indian team.
"Whenever Hardik Pandya is in the team, his role is huge. He bats and bowls very consistently. His batting is crucial when the team is stuck. If we have a score of 160 on the board in 15-16 overs and Hardik is batting, then he's the one who can help the team reach 210-220 from there or if we are 50 for 4, he has to build the innings.
"Batting in the middle order at 5, 6, or 7 is very tough. That is why Hardik's role is critical in any format. We know his bowling. He bowls in key phases, with the new ball, in the middle and in the death as well. His role is very important because he gives the team balance, letting us play six bowlers and keep our batting deep."
Rohit said accommodating both Kuldeep Yadav and Varun Chakravarthy together in the playing XI is going to be a big challenge for the Indian team management.
"The biggest challenge for captain Suryakumar Yadav and coach Gautam Gambhir will be how to play both Kuldeep Yadav and Varun Chakaravarthy together. If you want that combination, you can only do it if you play with two seamers, which is a big challenge.
"But honestly, I would be tempted to play both Varun and Kuldeep because they are wicket-takers and batters struggle to read them. I would surely pick them."
The former India skipper added, "Looking at the conditions in India, like in this New Zealand series, there is a lot of dew. In February and March, dew will be heavy across most parts as winter ends.
"Even in Mumbai, which doesn't get cold, there's still dew. I'd say 90-95 percent of grounds in India have dew. That's the challenge. What do the coach and captain think? Are they comfortable with three spinners? Then they can play spin, but there's no fixed rule. It depends on the team leaders' thinking."
Rohit also urged Kuldeep to stop appealing on every ball and to rely on the wicketkeeper's judgment for reviews.
"My one simple advice to Kuldeep is to just bowl quietly and go back to his mark. You can't appeal on every ball. This is basic. I keep saying it, but it still happens often. Even after telling him many times, he appeals at every chance. You have to use your head. Just because it touches the pad, it doesn't mean it's out every time. This isn't gully cricket.
"I get he is enthusiastic, but think of the team first. Each team only gets two DRS reviews. If I was the keeper, I could see where the ball pitched and if it was hitting, I could tell the bowler.
"But from covers or slip, you don't know the angle. You have to listen to what the keeper and bowler say. That's why when there's a review off Kuldeep's bowling, I don't look at him, I look at the keeper to decide."
The T20 World Cup is scheduled to be held in venues across India and Sri Lanka from February 7 to March 8.
