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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" <email@example.com>
To: <firstname.lastname@example.org>; "'Dinosaur@usc.edu'" <email@example.com>
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.