Evolution of new species in a few generations is probably something of an overstatement. The Cambrian Explosion appears to have lasted on the order of 10 to 20 million years. Even if you allow for chains of 100,000 distinct species (surely that is on the high side) between the basal "worms" that left the first Planolites type tracks and the first arthropods, echinoderms, chordates, et. al. that's 100-200 years per species. These are small animals that probably bred more than once a year.
On the other hand, I'm not going to start a war by changing this on my own.
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