That may also explain quick-frozen Siberian mammoths who died and were frozen standing up also. Our poles flip every so often, South to North and vice-versa. Scientists say that when lave flows out of a volcano that it "grains" according to the magnetic field. That tells me that there is a force in the crust of the earth wherever there is lava solidified (which is most of the earth) that will try to align with the poles of the earth's core like a compass needle. If the earth's crust were molten, then each individual molecule would simply turn with a pole switch where it sits, being able to slide against each other in a liquid state. But since the earth's crust is solid there will be an integrated force that will attempt to move the whole crust and being that the crust sits on a liquid mantle, it may be able to do that.
Something I thought of two days ago when I woke up. That's when I do my best thinking. :^)
That may also explain quick-frozen Siberian mammoths who died and were frozen standing up also. Our poles flip every so often, South to North and vice-versa. There is a Russian scientist or author, I believe his name is Kolisimov, who has speculated that the sudden freezing of Siberia was caused by an abrubt tilt of the earth on it's axis due to impact by a celestial body (comet, etc.). I don't recall the impact date he cited.