[ETL]

The hidden crater Under a lobe of ice on northwest Greenland, airborne radar and ground sampling have uncovered a giant and remarkably fresh impact crater.

Though not as large as the dinosaur-killing Chicxulub impact, Hiawatha crater may have formed as recently as the end of the last ice age, as humans were spreading across North America.

Meltwater from the impact could have triggered a thousand-year chill in the Northern Hemisphere by disrupting currents in the Atlantic Ocean.

Where is the impact debris?

None of the drilled Greenland ice cores (red dots) contains meteoritic debris. But one, GISP2, shows a spike in platinum about 12,900 years ago.

A deep disturbance

Radar reflections from volcanic grit trapped in the ice can be tied to dated ice cores drilled elsewhere. Those reflections stop at 11,700 years ago. Below that, the ice is disturbed. The crater’s bed is rough, not yet smoothed down. This points to an actively eroding young crater less than 100,000 years old.

Telltale rocks

Samples near the gla cier’s outlet contained beads of once-molten glass and shocked quartz—crystals scarred by hightemperatures andpressures.

Rebound effect

After an impact, rebounding molten rock piles up in a central peak and sometimes collapses into a peak ring—one way todistinguish an impact crater from a volcano.

[ETL]

More here...

Huge crater discovered in Greenland from impact that rocked Northern Hemisphere

November 14, 2018, University of Kansas

https://phys.org/news/2018-11-huge-crater-greenland-impact-northern.html

[E. Pluribus Unum]

Evidently they believe climate never changed until humans arrived.

[noiseman]

”After an impact, rebounding molten rock piles up in a central peak and sometimes collapses into a peak ring—one way todistinguish an impact crater from a volcano.”

I’ve always wondered why so many craters on the Moon have small peaks in the center. This answers that.

[C210N]

Until human-driven global warming set in, that ...

The money quote. Literally.

Studies like this don't grow on trees.

[DuncanWaring]

Ping.

[Mr. K]

I can easily imagine this causing global tsunami’s that took weeks to drain (How long was Noah on the ark?)

[Bonemaker]

“Where is the impact debris?”

Illinois

[mrsmith]

A recent impact should also have left its mark in the half-dozen deep ice cores drilled at other sites on Greenland, which document the 100,000 years of the current ice sheet's history. Yet none exhibits the thin layer of rubble that a Hiawatha-size strike should have kicked up. "You really ought to see something," Severinghaus says.

Brandon Johnson, a planetary scientist at Brown University, isn't so sure. After seeing a draft of the study, Johnson, who models impacts on icy moons such as Europa and Enceladus, used his code to recreate an asteroid impact on a thick ice sheet. An impact digs a crater with a central peak like the one seen at Hiawatha, he found, but the ice suppresses the spread of rocky debris. "Initial results are that it goes a lot less far," Johnson says.

So drill closer to it.

[Grimmy]

That Thule AB was put where it was so that an eye could be kept on that impact area points to proving that it was an egg of The Great Old Ones that hit rather than a simple inorganic rock.

[Fireone]

Nope, it was cow farts.

[fruser1]

“roughly 13,000 years ago, just as the world was thawing from the last ice age”

My pet peeve.

We are still in an ice age that is currently 4 million years old.

The event above was the last GLACIATION, which is when glaciers advance significantly WITHIN an ice age.

We have had 60 such glaciations in the past 4 million years as evidenced by layers of morraine.

Note, after a glaciation, the glaciers retreat significantly (the other half of the cycle).

All occurring naturally without human causes.

Based on the relatively recent activity, you’d expect it to be getting warmer overall now. Just going off averages, we’d be 15000 years into a 33000 year warming cycle, to be followed by another 33 of cooling (presuming we remain in ice age).

And given the fact that ice ages only make up about 25% of earth’s geologic history, you’d also logically conclude that being in an ice age is not the normal state - it SHOULD be warmer.

AND in case you haven’t noticed that there seems to be much more life in warmer climes than at the poles, you’d also want to conclude that WARMER IS BETTER!

[Mr. K]

"Until human-driven global warming set in"

Interesting article, but hard to take them seriously after that sentence...

I am so sick of this bull$hit. Show us factual data of this 'settled science' on climate change...?

Not the FAKED data from that moron at NASA.

[crusher2013]

Is this the clovis impact crater?

[PIF]

But one, GISP2, shows a spike in platinum about 12,900 years ago.

---

Remains of the comet debris that struck the Earth in 10900 BC ending the glacial warming period and bringing on the Younger Dryas. c. 12,900 to c. 11,700 years BP

See Carolina Bays - Evaluation of an impact hypothesis

[ar15ona]

I read the article until it stated “Until human-driven global warming set in...” and then I hung up the megaphone

[ar15ona]

I read the article until it stated “Until human-driven global warming set in...” and then I hung up the megaphone

[adaven]

I’m sure Graham Hancock is smiling about this story.

[csvset]

Hidden beneath Hiawatha is a 31-kilometer-wide impact crater, big enough to swallow Washington, D.C.,

If only. How is it the glacier is named Hiawatha ?

[dennisw]

Very cool research by real scientists.