Actually, I find this mildly intriguing. What is not taken into account, however, is the reality that in order for this to be true, the rate of spin of the earth would necessarily slow down as the earth got bigger, due to conservation of angular momentum. It is quite simple to calculate the rate of expansion of the earth over the time period suggested. I watched this on Friday, and don’t remember what they said, but I think it was 700 million years.
If the surface of the earth was completely covered by land (no oceans) 700 million years ago, and now, the earth’s surface is about 71% covered by ocean, we can calculate the old size of the earth, and thus determine the relative rate of spin.
Current earth:
Surface area: 510,065,600 km^2
radius: 6378 km
Old earth:
29% of curr. earth:
Surf area: 147,919,024
radius: 3436 km.
So the old earth would have had roughly half the radius of the current earth, which means it would have had to be spinning twice as fast at that time.
If earth’s day was only 12 hours as opposed to 24 hours only 700 million years ago, we would know this rather definitively.
According to wikipedia:
Seems plausible, at this point. But the very next piece of information in the article:
If they can measure time by these alternating strata, and the Moon is a factor in slowing down the Earth’s rotation, then couldn’t they use the same tools to determine when the Moon first started orbitting the Earth? Then again, I don’t know that there is any stone left on Earth old enough, perhaps, to show thiese changes.