"...dating to between 24.5m and 2.5m years ago and only a few of which survive today.

Dr van Dam correlated the results with natural cycles in the Earth's orbit and found that every 2.4m years there was a flurry of both mammal extinctions and new species..."

Has anyone been able to find out where we are in that cycle now? There was a mass extinction that occured 70,000 years ago, as identified by human DNA research. Could it have been the apex of the cycle?