Right now there's not much that's scientifically
serious and easy to find.
WORLD WIDE WEB LINKS
A half billion years ago, during the Late Precambrian,
life on earth underwent a profound diversification...with relative
evolutionary rates of more than 20 times normal, nothing like it has
occured since....This coincides with another apparently unique
event--a 90 degree change in the direction of Earth's spin axis
relative to the continents. The poles became the equator and two
points near the equator became the poles.
- Evidence for a Large-Scale Reorganization of Early
Cambrian Continental Masses by Intertial Interchange True Polar
Wander by Kirschvink, Ripperdan and Evans (full text published in
SCIENCE, v.277, p.541-545.)
Analyzes the physics of an event where a "relatively small "
asteroid collides with earth, causing "almost instantaneous changes
of the axis of rotation and therefore instant-aneous shifts of the
(We hosts are not competent to judge the quality of Sr.
Barbiero's mathematical analysis. If anyone wants to comment, e-mail
us. In any case, we would like to see the issue of ice-mass effect
treated with analytic seriousness.)
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