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Re: Why non-avian dinosaurs weren't able to survive



On 11/24/2015 10:56 AM, Denver Fowler wrote:
> The uppermost Hell Creek (towards the K-Pg) is actually a period of high 
> accommodation 
and significant deposition. The reason why the iridium layer & various
ashes are preserved at
the K-Pg (and a few metres above and below) is because there is
deposition occurring.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

This is a sudden extinction event, not a volcano, or ever a super
volcano, but an event so horrific in history, that it very likely warped
the very shape of the earths crust all about the planet.  Ntt ring it
like a bell but squash it like a piece of silly putty.  Look at that Ir
deposit, and think about it.  Your looking at what? 2 or 3 inches of
clay across most of the globe.  How many millions of years would that
normally span across a normal sedimentary situation.  That clay layer
was likely laid out in a year or two.


https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Cretaceous_Paleogene_clay_at_Geulhemmergroeve.jpg/1024px-Cretaceous_Paleogene_clay_at_Geulhemmergroeve.jpg


You look at that clay layer and remember that clay is formed largely of
deposits of dead biological material mixed in otherwise organic rock.
This is a MASSIVE scar that runs through the geography of the entire
planet.  Even a supervolcano eruption such as like at Yellow Stone
doesn't scale to this impact.  It might well have been the largest
impact that planet had seen since the moon split from the earth.

If your trying to apply the model of normal sedimentation and die offs,
like the sand dunes in Mongolia, or the mammalian skeleton beds of North
America, you have to at least consider that your model is fundamentally
broken. This event caused a die off of even calcareous nanoplankton, and
very suddenly, even on a human lifetime scale, forget about a geological
time scale.  Do you realize how hard that is?  Microbiological forms of
life evolved in early bombardment of the planet and would grow back so
quickly in the aftermath of any world event, that it would never be
noticeable on geological scale.  And yet the nanoplankton vanished from
the fossil record.  This is a rock that is nearly 15-kilometers in
length which hit a troposphere only about 12 kilometers high.  It just
caused a sucking vacuum as it impacted the planet.

AND in addition to that, it is very likely wasn't the only meteor hit.
A rock like that usually comes with friends.

You have this problem backwards.  An explanation where anything other
than this event caused the mass extinctions of the KT would need to be
proven by __extraordinary evidence__ because this impact was so severe,
it doesn't need any help in explaining the massive destruction of at the
KT boundary.  This was an event so severe, that is lucky that anything
survived.

I really don't know why you expect to find bone beds in North America
immediately before or after this event or any kind.