The Core of Geomag Reversals

I am reading an article from Nature about the geomagnetic reversal. Apparently, there looks to be a correlation between the cooling and solidifying of the Earth's inner core and the polarity reversals. The article is not very specific. It is likely that as the inner core solidifies a new layer, the planet's polarity reverses as a side effect. A nickel iron core could conceivably do this, in theory. But we also know that theory and reality are typically two different ball games. In science, the theoretical is merely the ideal situation and the ideal is rarely ever the reality - at least not exactly.

There was also mentioned the Cretaceous Normal Superchron [CNS] a long span of time when there were no reversals. Why this is the case, I do not know - but I believe comparing that time interval to times when reversals are normal might shed some light on the situation. It may even give us some clues about the cause of the reversals. Interestingly enough, the CNS ended around the same time as the K-T event. A possible correlation, perhaps?! Could a meteorite cause this no-reversal time to switch back to normal geomagnetic flip-flopping? If it was an iron asteroid, this would be likely. Like two magnets hitting each other. But what exactly started the CNS in the first place? Another previous iron asteroid meteorite - switching the field off?

Also, as I was skulking about on the Google Scholar site looking up solar forcing articles - I noticed one that said something about the reversals being correlated with glacial periods. Unfortunately, the article itself was not accessible - but I am hopeful that more are out there - maybe I can look at the references of that article and at least peruse the abstract. Just the info I was hoping for. Toodles!