Re: Suspicious impact craters and iridium layers?

[Dora Smith <villandra@austin.rr.com>]

I actually am interested in this - because it supports my suspicion that
more than one event contributed to the K-T extinction.

10,000 years is a pretty short time when it comes to explaining extinction.
Neanderthals took maybe 65,000 years to go extinct.   It had to do with
unfavorable competitive conditions relative to homo sapiens, and a slightly
lower rate of reproduction, over time.

It could have been like, the number 1, 2, knockout punch.

Yours,
Dora Smith
Austin, Texas
villandra+AEA-austin.rr.com
----- Original Message -----
From: +ACI-David Marjanovic+ACI- +ADw-david.marjanovic+AEA-gmx.at+AD4-
To: +ACI-DML+ACI- +ADw-dinosaur+AEA-usc.edu+AD4-
Sent: Thursday, June 16, 2005 2:52 PM
Subject: Re: Suspicious impact craters and iridium layers?


+AD4- ----- Original Message -----
+AD4- From: +ACI-Dora Smith+ACI- +ADw-villandra+AEA-austin.rr.com+AD4-
+AD4- Sent: Thursday, June 16, 2005 11:53 AM
+AD4-
+AD4- +AD4- Good evidence supports both the impact theory, and the Indian traps
+AD4- +AD4- theory,
+AD4- +AD4- of the end Cretaceous extinction.
+AD4-
+AD4- Very often in science the longer one looks at a phenomenon, the more
+AD4- complicated it turns out to be. This doesn't seem to be the case here,
+AD4- however. The timing of the Deccan traps seems not to fit. In at least one
+AD4- place in India the K-Pg boundary lies in the sediments between two basalt
+AD4- flows. Perhaps more importantly, the episode of the biggest eruptions
ended
+AD4- some 100,000 years before the boundary and thus before the mass
extinction.
+AD4- It did have worldwide effects -- a slight rise in global temperature.
+AD4- http://dml.cmnh.org/2003Dec/msg00092.html
+AD4-
+AD4- +AD4- Can it be that more than one factor contributed to such a 
catastrophic
+AD4- +AD4- extinction, and that the extinction itself took longer than one 
factor
+AD4- +AD4- would
+AD4- +AD4- explain?     It really isn't inconsistent to think of it that way.
+AD4-
+AD4- Of course not. But in +AF8-this+AF8- case the data argue against such
complications.
+AD4- The Deccan traps don't have the right ages, and the mass extinction was
+AD4- very, very short.
+AD4-
+AD4- +AD4- Also, the end Permian extinction has been shown to have taken an
extremely
+AD4- +AD4- long time to come about.   The environmental impacts of the 
catastrophes
+AD4- +AD4- that caused it occurred in stages over a long period of time.    It
wasn't
+AD4- +AD4- just a meteor fell or whatever and the following year, everything 
was
+AD4- +AD4- extinct.
+AD4-
+AD4- Yes. But that's another story.
+AD4-