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RE: Theories on the extinction of dinosaurs



There's lots of theories out there - some are more accepted than others in
different parts of the world, depending on local evidence.

But, and I'm not being facetious here, the actual reason probably boils down
to bad weather.
Or, more correctly, a sustained period of climatic variation.

Whether this is caused by impact, volcanism, realigning of the continents,
polar inversions, or any of the other things that were going on at the KT
boundary is something that perhaps we'll never know for certain.
My personal opinion is that each contributed significantly to change the
climatic patterns, which combined with other ecological pressures
(alteration in the dominant flora, mammalian expansion etc.) to make the
latter half of  the Cretaceous a pretty damn difficult time to be alive.
Especially for a group of creatures that don't adapt to changing
circumstances very well.

John

-----Original Message-----
From: Pedro José Lorca Hernando [mailto:pjlorca@msl.es]
Sent: 04 November 1999 11:24
To: dinosaur@usc.edu
Subject: Theories on the extinction of dinosaurs


Hello all:
What is the most accepted theory for the extinction of dinosaurs? A
meteorite? The explosion of a supernova?

Pedro José Lorca Hernando