Assuming you could figure out where you were on the map. That might not be as easy as it would seem. Getting a reasonable approximation to latitude wouldn't be that difficult, but beyond that there's not going to be any landmarks to tell you which continent you are on.

If it's in the Cenozoic or even parts of the Mesozoic you might get some biogeographic information from flora and fauna, but that's going to be sparser, and require some pretty specialized knowledge the further back you go. Those flora and fauna might even be your only real clue as to which time period you are in.