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Re: EXTINCTION THEORIES
If you sent mail to the list during the past week or so, most likely
it did not make it to me. However, some mail queues will hold onto
things even for a week. Unless there is something urgent, please hold
off on sending duplicates. There are a few things, however, that have
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The following was submitted by Scott Horton. He was responding to a
question from Dana L. Naldrett relating to a recent episode of
Date: 24 Mar 1995 19:08:13 -0500 (EST)
From: Scott <HORTON@BCRSSU.AGR.CA>
>Similarly, if climate change were responsible, why did the mammals
>survive, and SOME of the reptiles and amphibians?
If climate change were slow, the dinosaurs should have
adapted. After all, there were dinosaurs living in cooler areas like
Antartica. Essentially, a meteorite impact would have brought on a
VERY RAPID AND SEVERE climate change. A slow mild type of climate
change would not explain the extinction of marine reptiles and other
marine and flora species.
>The last theory relates to the land bridges and the movement of
>creatures over them. The theory goes that with the transported
>animals came new diseases that killed off the dinosaurs.
>Dana Naldrett (firstname.lastname@example.org)
Again, this theory cannot explain the simultaneous extinction of
marine reptiles and other marine and flora species. Remember that
although the K/T extinction event makes most of us think of
dinosaurs, the vast majority of species that disappeared then were
non-dinosaurian. Also, I cannot think of a single instance of a
disease completely wiping out a disease. There are always survivors,
such as during the Black Plague in Europe. This was discussed on
this list a couple months ago.
Conclusion? Not all the problems of the meteorite impact theory have
been worked out yet, but the other theories proposed so far have
more fundamental problems.