Hi Bruce, I agree there is definitely potential for other interesting lessons. Your comment on the presence of both Megalodon and the Great White made me think of the Tamiami Formation here in Florida. When I went to SMR with Roger, I was told that both could be found there as well. I would need to go back and look at the actual ages of the Tamiami and the Purissima formations to see how well they correlate, but the two may offer an interesting comparison of the Atlantic vs. the Pacific at a time when the marine connection between the two was no longer present. Likewise, this could be expanded to other taxa as well.