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ianw16 Wrote:
-------------------------------------------------------
> D-Archer Wrote:
> --------------------------------------------------
> -----
> > I mean the actual location of the physical
> north
> > pole, that has shifted over time.
> >
> > Likely due to a shift of the entire crust (wrt
> the
> > underlying mantle), such a sudden shift
> explains
> > the mammoths with grass still in their mouths.
> >
> > Regards,
> > Daniel
>
>
> Which is complete and utter nonsense, with not an
> iota of evidence to support it.

That is not quite accurate. The Earth's core rotates faster than the Earth's crust. See here. So we have a solid crust, floating on a liquid mantle, which is above a solid core, each rotating at different speeds. It is therefore possible for the crust to slip. The mathematics describing "true polar wander" permit it. Most likely any such slippage would range from less than a single degree of arc to much less than a single degree of arc. So no, almost certainly not the case that the Earth's crust would slip 45, or 90, or 180 degrees. But a few degrees over periods of time - yes. Geologists don't really dispute this. Big slippages, like Velikovsky asserted - yeah they dispute that.

Also, the slippage does not occur as a single event. It is likely to be a sequence of small slippages, each a fraction of a degree of arc. One of the best pieces of evidence that this occurs is demonstrated by the creation of the Hawaiian island chain. The crust moving over the hot spot, slipping and then pausing, is what created the island chain. The slippage is about 3 degrees of arc, and took place over millions of years. In other words, plate tectonics plus true polar wander. See image:



The rate of true polar wander is estimated at about 1 degree of arc per million years. So slow. An article regarding how geologists try to separate the effects of true polar wander from plate tectonics may be found here.

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Subject Views Written By Posted
Things found where the ice is melting 1008 ldennyjr 11-Mar-19 17:46
Re: Things found where the ice is melting 225 D-Archer 11-Mar-19 20:03
Re: Things found where the ice is melting 202 ianw16 11-Mar-19 21:02
Re: Things found where the ice is melting 182 D-Archer 13-Mar-19 15:59
Re: Things found where the ice is melting 177 ianw16 13-Mar-19 16:49
Re: Things found where the ice is melting 176 D-Archer 14-Mar-19 13:51
Re: Things found where the ice is melting 185 ianw16 14-Mar-19 13:58
Re: Things found where the ice is melting 140 sunny_eyes 21-Mar-19 13:28
Slippage 147 Race Jackson 14-Mar-19 20:02
Re: Slippage 152 ianw16 14-Mar-19 20:51
Re: Slippage 172 Race Jackson 14-Mar-19 23:18
Re: Slippage 128 sunny_eyes 21-Mar-19 12:26
Re: Things found where the ice is melting 200 Nolondil 11-Mar-19 20:40
Re: Things found where the ice is melting 125 ldennyjr 21-Mar-19 13:56
Re: Things found where the ice is melting 153 drrayeye 21-Mar-19 19:42
Re: Things found where the ice is melting 236 ldennyjr 21-Mar-19 19:55
Re: Things found where the ice is melting 149 sunny_eyes 20-Mar-19 18:34


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