[Rockhounds] Iridium in undersea crater confirms asteroid wiped out the dinosaurs

[J Bryan Kramer]

>
> both events are not so far apart on the geological timescale.
> Most likely both events conspired to the demise of the dinosaurs.
>

That's probably likely. And I recall during my long ago history of science
class that the same people don't want to change points being made. In the
case of the vitalism debate and the gradualism vs catastrophism in geology,
the theories weren't fully accepted until the old believers died off. Plate
tectonics was put forth back in the eighteen hundreds wasn't it?  But this
lecturer looked middle aged at most.  And the impactor theory was made by
the Alverazes in 1980, 41 years ago.
BK

““There exists a law…inborn of our hearts…by natural intuition. … If our
lives are endangered by plots or violence or armed robbers or enemies, any
and every method of protecting ourselves is morally right.””
Cicero

J Bryan Krämer       North Florida, USA
photos at: http://pbase.com/photoburner


On Wed, Feb 24, 2021 at 6:11 PM Doug Bank <dougbank at alum.mit.edu> wrote:

> I have found geology texts from the 1970s that still did not accept plate
> tectonics! People are stubborn.
>
> > On Feb 24, 2021, at 4:37 PM, J Bryan Kramer <codeburner at gmail.com>
> wrote:
> >
> > I watched a lecture about the Washington flood basalts a week ago and was
> > interested to observe that the lecturer pinned the dinosaur extinction on
> > those volcanos with not one word about Chicxulub. I knew some geologist
> > were skeptical when the asteroid theory was announced by some physicists
> > but I'm surprised to see the resistance still exists this many years
> later.
> >
> > BK
> >
> > ““There exists a law…inborn of our hearts…by natural intuition. … If our
> > lives are endangered by plots or violence or armed robbers or enemies,
> any
> > and every method of protecting ourselves is morally right.””
> > Cicero
> >
> > J Bryan Krämer       North Florida, USA
> > photos at: http://pbase.com/photoburner
> >
> >
> > On Wed, Feb 24, 2021 at 4:25 PM Kreigh Tomaszewski <kreigh at gmail.com>
> wrote:
> >
> >> Strong evidence that the dinosaurs were killed-off 66 million years ago
> by
> >> an asteroid hitting Earth has been found in Chicxulub crater under the
> Gulf
> >> of Mexico. An international team has measured an abundance of the rare
> >> element iridium in the crater and similarly high concentrations of the
> >> element are known to occur in sediments laid down at the time of the
> >> Cretaceous–Paleogene boundary (K–Pg) extinction event, which saw many
> >> species on Earth vanish.
> >>
> >> Measuring 200 km across, the Chicxulub crater is believed to have been
> >> created by an 11 km-wide asteroid crashing into Earth. The impact would
> >> have sent vast amounts of vaporized rock into the atmosphere, blocking
> out
> >> the Sun and creating a winter that could have lasted lasted several
> >> decades. The result, scientists believe, was the mass extinction of 75%
> of
> >> species on Earth including the non-flying dinosaurs.
> >>
> >>
> >>
> https://physicsworld.com/a/iridium-in-undersea-crater-confirms-asteroid-wiped-out-the-dinosaurs/
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