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Re: paleontolgist, dinosaur
On Thu, 7 Nov 1996, Stan Friesen wrote:
> > 1. What is your theory about how the dinosaurs got extinct?
> A combination of causes occuring in a geologically short time period
> combined to drive them to extinctions. Some of the main contributors
> 1. The volcanic eruptions forming the Deccan Traps in India.
> 2. The lowering of sea levels to nearly as low as they now are.
> 3. The impact of a giant meteorite, perhaps in the Yucatan
> 4. Possibly (little evidence available as yet), an large
> decrease in the oxygen content of the oceans (oceanic anoxia).
These are events, not causes. How did they drive all dinos (big and
small) to extinction while leaving many other terrestrial lineages
unaffected. Archibald's Montana data shows the following % species
Placentals - 100%
Marsupials - < 10%
Lizards - > 25%
Turtles - > 80%
Crocs - > 75%
Champosaurs - 100%
and, of course, non-avian dinosaurs, 0%
How did your events, real though they may be, affect the other reality
reflected in the available fossil evidence?