Are mass extinctions linked to severe impacts?

Some geologists believe that about 380 mn yrs ago, a rock from space smashed into Earth, wiping out a large fraction of life.

By: ASIAN NEWS INTERNATIONAL
| Updated on: Jun 26 2003, 13:15 IST

Is there a connection between mass extinctions and severe impacts? Some geologists think there is, believing that about 380 million years ago, a rock from space smashed into the Earth, wiping out a large fraction of life.

So far, the only candidate for a link is the meteor 65 million years ago that some believe helped exterminate the dinosaurs.

You may be interested in

MobilesTablets Laptops
28% OFF
Samsung Galaxy S23 Ultra 5G
  • Green
  • 12 GB RAM
  • 256 GB Storage
Google Pixel 8 Pro
  • Obsidian
  • 12 GB RAM
  • 128 GB Storage
Vivo X100 Pro 5G
  • Asteroid Black
  • 16 GB RAM
  • 512 GB Storage
Apple iPhone 15 Plus
  • Black
  • 6 GB RAM
  • 128 GB Storage

Signs of an earlier catastrophe coincide with a disappearance of many animals, according to Brooks Ellwood of Louisiana State University, Baton Rouge, USA, 'It doesn't mean that the impact killed off the critters, but it's suggestive that it had something to do with it,' he was quoted as saying by the journal Nature.

Also read
Looking for a smartphone? To check mobile finder click here.

It's not known where a rock struck, although it's possible that traces of a crater might be found, Ellwood adds.

Other researchers agree that there was an impact around that time but feel the evidence for a mass extinction is much weaker.

Ellwood's team found that rocks in Morocco laid down about 380 million years ago bear a layer of sediment that resembles the debris from a cataclysmic explosion. The sediment has unusual magnetic properties and contains grains of quartz that seem to have experienced extreme stresses.

Around this time, about 40 per cent of marine animal groups vanished from the fossil record, says the team. Ellwood posits an asteroid slightly smaller than the 10-kilometre rock suspected of killing the dinosaurs.

The evidence for an impact is compelling, says geologist Paul Wignall of Leeds University, UK. And linking it to a mass extinction would be a major finding. 'The potential lethality of impacts would be greatly increased,' he says, the magazine reported.

But it's not clear how much disappeared around the time of the impact - the death toll may be far lower than Ellwood's team suggest, says Wignall. He thinks palaeontologists should search the rocks for a better picture of what happened at that time.

Catch all the Latest Tech News, Mobile News, Laptop News, Gaming news, Wearables News , How To News, also keep up with us on Whatsapp channel,Twitter, Facebook, Google News, and Instagram. For our latest videos, subscribe to our YouTube channel.

First Published Date: 14 Jun, 18:58 IST
NEXT ARTICLE BEGINS