Announcement

Collapse

Natural Science 301 Guidelines

This is an open forum area for all members for discussions on all issues of science and origins. This area will and does get volatile at times, but we ask that it be kept to a dull roar, and moderators will intervene to keep the peace if necessary. This means obvious trolling and flaming that becomes a problem will be dealt with, and you might find yourself in the doghouse.

As usual, Tweb rules apply. If you haven't read them now would be a good time.

Forum Rules: Here
See more
See less

Dinosaurs were hit with a double whammy 65 million years ago

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Dinosaurs were hit with a double whammy 65 million years ago

    ~65 million years ago the earth was stuck twice with asteroids one in the Yucatan and onr in the Ukraine.

    Source: https://www.smithsonianmag.com/science-nature/new-research-impact-crater-blows-away-previous-estimates-its-age-180978023/



    New Research of Impact Crater Blows Away Previous Estimates on Its Age

    Scientists say the Boltysh crater in Ukraine formed well after the impact in Mexico that caused the dinosaurs to go extinct

    New Research of Impact Crater Blows Away Previous Estimates on Its Age


    Scientists say the Boltysh crater in Ukraine formed well after the impact in Mexico that caused the dinosaurs to go extinct

    An artist’s illustration shows an asteroid hitting Earth. Large impactors hit the planet every one to three million years. (Andrzej Wojcicki via Getty Images)By Shi En Kim
    SMITHSONIANMAG.COM
    JUNE 18, 202116137
    If you travel 140 miles southeast of Kiev, Ukraine, just before you reach the tiny village of Bukvarka, you’ll arrive at a patch of forest that streaks across agricultural lands. The gently sloping meadows and cottages are bucolic, giving no indication of the area’s violent past. But burrow down 1,700 feet or so and you’ll find the remnants of a catastrophic impact: a 15 mile–wide asteroid crater.

    Scientists say that about 65 million years ago an asteroid the length of three Eiffel Towers struck here, its fiery fallout blanketing an area the size of present-day Vermont. The impact dumped a colossal amount of heat into the ground—enough to melt rock and form a massive depression called the Boltysh crater, a hole now filled in by asteroid detritus and sediments of a lake long gone.

    Previous studies have assigned the Boltysh impact event a broad range of dates to suggest that it may have coincided with the Chicxulub impact event—with the two asteroid strikes both contributing to the extinction of the dinosaurs. Now, a more precise follow-up study published today in Science Advances suggests the Boltysh impact occurred 650,000 years later than the Chicxulub impact, long after the dinosaurs disappeared. Though the Boltysh impact is no longer fingered in the famous mass extinction event, pinpointing the crater’s age has allowed scientists to correlate the asteroid strike to other global shake-ups of its time.

    “You’re trying to document a major event that basically, surely shaped the biosphere and changed evolution of the Earth,” says Philippe Claeys, a geologist at the Free University of Brussels, Belgium who didn’t participate in the study. “You will need to understand every event taking place at that moment. Is it important to document an event like Boltysh? Absolutely.”

    Annemarie Pickersgill, a geologist at the University of Glasgow, UK who led the research, dated the Boltysh crater by looking at the age of the sediments that had settled on top. These sediments came from the rocks that were melted by the asteroid impact and the soil that had accumulated over the millions of years since. Her team examined the cores drilled from this sedimentary pileup using a dating method that measures the accumulation a particular isotope of argon and estimated the crater’s age to be 65.39 million years.

    © Copyright Original Source






    Glendower: I can call spirits from the vasty deep.
    Hotspur: Why, so can I, or so can any man;
    But will they come when you do call for them? Shakespeare’s Henry IV, Part 1, Act III:

    go with the flow the river knows . . .

    Frank

    I do not know, therefore everything is in pencil.

  • #2
    Interesting. As Shoemaker-Levy demonstrated, things like asteroids and comets can break up and make multiple impacts. Here is a chain 23 tiny craters in a string up on the moon



    One is suspected to exist in the central U.S., stretching in a line 435 miles from eastern Kansas, across Missouri, and across the southern tip of Illinois. It consists of eight circular depressions, ranging from 1¾ to 10½ in diameter, with at least two confirmed as impact craters dating from roughly 300 mya.





    And IIRC there might be some up in Canuckistan as well. In any case, these are pretty close together, unlike Kiev and the Yucatan Peninsula.

    I'm always still in trouble again

    "You're by far the worst poster on TWeb" and "TWeb's biggest liar" --starlight (the guy who says Stalin was a right-winger)
    "Of course, human life begins at fertilization that’s not the argument." --Tassman

    Comment


    • #3
      The thread title implies that the dinosaurs were around for both impacts, but the article says otherwise.

      Comment


      • #4
        Originally posted by Stoic View Post
        The thread title implies that the dinosaurs were around for both impacts, but the article says otherwise.
        Dagnabbit. I misread the article.

        I'm always still in trouble again

        "You're by far the worst poster on TWeb" and "TWeb's biggest liar" --starlight (the guy who says Stalin was a right-winger)
        "Of course, human life begins at fertilization that’s not the argument." --Tassman

        Comment

        Related Threads

        Collapse

        Topics Statistics Last Post
        Started by Sparko, Yesterday, 08:24 AM
        5 responses
        25 views
        0 likes
        Last Post TheLurch  
        Started by Cow Poke, 08-02-2021, 08:31 PM
        11 responses
        56 views
        0 likes
        Last Post Cow Poke  
        Started by lee_merrill, 08-02-2021, 07:14 PM
        10 responses
        52 views
        0 likes
        Last Post TheLurch  
        Started by rogue06, 07-27-2021, 09:39 AM
        34 responses
        136 views
        1 like
        Last Post rogue06
        by rogue06
         
        Started by shunyadragon, 07-25-2021, 08:57 AM
        0 responses
        16 views
        0 likes
        Last Post shunyadragon  
        Working...
        X