[Rockhounds] Massive meteor crater discovered beneath Greenland's ice is much older than thought

[Murowchick, James]

I think they said the crater was 31 km wide and the Chixilub crater was 200 km I diameter.  The crater produced by an impact is far, far wider than the meteorite causing it.
Jim
James Murowchick, Ph.D.
Professor Emeritus
Department of Earth & Environmental Sciences
University of Missouri-Kansas City
420 Flarsheim Hall
5110 Rockhill Rd
Kansas City, MO 64110
murowchickj at umkc.edu


From: Rockhounds <rockhounds-bounces at rockhounds.drizzle.com> on behalf of Dora Smith <tiggernut24 at yahoo.com>
Date: Thursday, March 10, 2022 at 8:55 AM
To: rockhounds at rockhounds.drizzle.com <rockhounds at rockhounds.drizzle.com>
Subject: Re: [Rockhounds] Massive meteor crater discovered beneath Greenland's ice is much older than thought
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What was going on in the solar system at that time?

I wonder how this affected recovery from the Chicxulub asteroid and from
the Deccan traps, if they were even over yet?   The asteroid fell right
in the middle of the Deccan Traps and changed the nature of that eruption.

One other thing.   The CNN article says the Greenland asteroid was 19
miles or 31 km wide, and the Chixulub or whatever asteroid was 200 km
wide.  I thought the Chixulub (I give up) asteroid was 6 miles across?
Something seems mangled here.  If a hundred mile wide asteroid ever
smashed into Earth, I suspect it would melt the planet and break off
another moon.

Yours,

Dora Smith



On 3/9/22 4:21 PM, Kreigh Tomaszewski wrote:
> The age of a 31-kilometer (19-mile) wide meteorite crater discovered under
> a kilometer of Greenland ice had long puzzled scientists.
>
> The Hiawatha crater was exceptionally well preserved despite glacier ice
> being incredibly effective at erosion. Its state fueled talk that the
> meteorite might have hit as recently as 13,000 years ago.
> However, the crater, which is one of the world's largest, has now been
> definitively dated -- and it is much, much older. In fact, it slammed into
> the Earth just a few million years after dinosaurs went extinct, about 58
> million years ago.
>
> "Dating the crater has been a particularly tough nut to crack, so it's very
> satisfying that two laboratories in Denmark and Sweden, using different
> dating methods arrived at the same conclusion. As such, I'm convinced that
> we've determined the crater's actual age, which is much older than many
> people once thought," said Michael Storey, head of geology at the Natural
> History Museum of Denmark, in a news release.
> When the asteroid hit, the Arctic was covered in balmy rainforest with
> temperatures of around 68 degrees Fahrenheit (20 degrees Celsius). Local
> inhabitants would have included crocodiles, turtles and primitive
> hippo-like animals, said Storey, who was an author of a new paper on the
> crater published in the journal Science Advances.
> The Hiawatha impact crater could swallow up Washington DC and is larger
> than about 90% of the roughly 200 previously known impact craters on Earth.
>
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