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Re: ..not dinosaurs, but comets ...

I'd say a swarm of Tunguskas would be quite effective at flattening North America's fauna - the shockwave and radiant heating would be devastating. Look at those flattened Siberian forests from Tunguska's air-burst.


----- Original Message ----- From: "Tommy Tyrberg" <tommy.tyrberg@norrkoping.mail.telia.com>
To: <4mjmu@rogers.com>; "'Dinosaur@usc.edu'" <dinosaur@usc.edu>
Sent: Monday, January 05, 2009 5:42 AM
Subject: SV: ..not dinosaurs, but comets ...

The trouble with this theory is that only small impactors (like the Tunguska object) explode in the atmosphere without impacting, while exterminating megafauna all over North America (not to mention the rest of the world) would take a really big impact. A much better way to explain the absence of a crater would be to postulate an inpact on top of the Laurentide Ice Sheet. You could probably explain away a fairly large crater that way.

Tommy Tyrberg