PSN-L Email List Message

Subject: Re: Is the Permian extinction tied to a nearby Pulsar star?
From: "Tom Schmitt" tschmitt@..............
Date: Sat, 27 May 2000 15:47:05 -0400


At one or more of the mass extinctions Iridium spikes are found in the
sediments.  I think it was
Walter Alverez who first found this but I can not remeber where it was.  I
think in one of the
limestones in Italy, well anyway.

If there is a large Iridium spike associated with the Permian mass extection
(which I think there is) then it would suggest
the comet hypotheseis.

Yes a pulsar produces alot of energy but with 1/(r^2) r being
600x365x1440x60x300000 km,  there is
lot  of attenuation.

Interesting idea I will look at the web sites.  Back in the late 70's Karl
Felessa looked at the fossil
record in terms of  plate tectonics and showed that many major faunal
changes correlated with tectonics.

Tom Schmitt


----- Original Message -----
From: meredith lamb 
Sent: Saturday, May 27, 2000 1:58 PM
Subject: Is the Permian extinction tied to a nearby Pulsar star?

> Hi all,
> I suppose this is somewhat off topic, but being as the earth is
> a part of us, along with its history; the topic isn't too remote.
> Its seems that the southwest Pacific and Australia are having
> a "good go", what with the deep rocks, erupting volcanoe, huge
> undersea smokers found, and now it seems that another topic has
> popped up (it may have been expounded on in other media areas?).
> It seems that a newly discovered pulsar (August 1999), with a
> very slow period (~8 seconds), is only some 600 light years from
> earth.  Pulsars originally explode (like the Crab Nebula did), and
> then form and age.  This particular pulsar formed some 280
> million years ago.  Trouble is....the Permian extinction occurred
> roughly in the same time frame of 286-248 million years ago.
> According to what I've vaguely read, such a nearby explosion
> would surely have been devastating to life on earth then.
> See on the web about the pulsar at:
> The above web site also has storys on the volcanoe and big
> black smokers, explored by the ship the Franklin.
> Other web sites, to only crudely tie in this thought are at:
> Appreciate any notes or references from anyone in the know on
> this topic, if available.  I haven't seen any tie in to the Permian
> extinction and this specific pulsar?
> Take care,
> Meredith Lamb
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Larry Cochrane <cochrane@..............>