DaveC, I would agree that in some cases 100 years might not be enough. How about 5,000? Still not enough for the pinky finger to get smaller? How about for our useless tailbone to retreat further?

There must be some examples, over the past 5 millenia, that show some transitions going on that have been observed and measured... or maybe just noticed.

If it is only measurable in 1M year increments, then that only leaves about 4,600 evolutions of distinct major species. But that's not true either, for approximately 65M years ago, we had a mass extinction (hypothetically) that would mean that almost everything we see today has only had about 65 iterations.

Not enough time to develop everything we see here, methinks.

Thus, I think that the mutations occur much more quickly, in shorter time periods. Environmental conditions more than anything else would play the role.

DJ