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I did some research. Some researchers hypothesize a specific date, but there's no confirmation. This article provides a date range:
originally posted by: DaRAGE
I am searching for evidence that an asteroid or meteor or whatever hit Greenland about 11800 years ago. It hit the massive amount of ice that was on top of Greenland.
I cannot find it anywhere.
I was quite certain it was something like 11800 years ago. In fact the amount of time for where this asteroid hit greenlands ice shelf was quite specific, however it was sometime in the 11000 years and it could have been 11080, 11880, etc. I was quite certain about that. It was not average 12000 years. It was quite specific.
Is anyone able to find me such a specific date?
I found specific dates, but they are not confirmed.
originally posted by: DaRAGE
a reply to: Arbitrageur
Thanks for the research. I still havnt been able to find a specific date but I did recently find a 11,700 year date as well. Thanks for the information though.
How inaccurate? Got any links? I'm interested in accuracy.
I have recently come to learn that greenland ice core date samplings are highly inaccurate when it comes to dates.
I wouldn't have expected that, got any links about that?
It appears that ocean sediment layers and dates that way are much more accurate.
Seasonal variations in the concentrations of insoluble microparticles and/or stable isotopes are measured over the entire 400 m lengths of three ice cores, recovered by Greenland Ice Sheet Program (GISP). The resulting absolute time scales are probably accurate within a few years per thousand.
This video by NASA popped up in my youtube suggested videos, and suggests a similar date range, and says we are still not really sure about the impact date except it's relatively recent in geologic terms. It talks about how the crater was found.
originally posted by: Arbitrageur
So the date range extends from 12800 years ago to 100,000 years ago: