my bad, I forgot a zero. the two populations diverged 1,000,000 years ago. that's a long time. below is the link. don't know if Ken Krysko published the work yet but he has presented the data to Orianne/FWS and has been pretty well accepted by the scientific community.

http://www.flmnh.ufl.edu/herpetology/kk/kkresearch.htm