What if the entire theory of the break up of Pangea (or Gondwanaland) is wrong? What if the continents drifted differently and the big boom shifted the continents to where they are now by altering the original axis???
What on earth do you mean by "big boom?"
There isn't much doubt that Antarctica was in a different angle at one point, and a fertile land. The timing of when this occurred is questionable...but there isn't much doubt about this. But this tilt business is not an absolute thing...any number of earthquakes or meteors hitting the earth, can twist the angle slighly.
Just point into your mind a what-if situation. What if...four massive earthquakes occured within 24 hours and the tilt of the earth went south 2 degrees? The north pole would be nearer to Cold Lake, Canada...NY would be in the prevsious climate region of Montreal...Miami would move up on the climate location of North Florida and see more freezes. It doesn't take alot to make this scenario occur.
The ice age was more likely caused by the water vapor that fell during Noah's Flood, that would explain the ice age a lot easier than a meteor or volcano could.
http://www.accuracyingenesis.com/iceage.html
http://www.angelfire.com/mi/dinosaurs/mammoth.html
http://www.answersingenesis.org/home/area/faq/iceage.asp
Ice Age Questions and Answers