Rhinoceros way back

At http://archaeologynewsnetwork.blogspot.co.uk/2014/03/precursor-of-europe… …. fossil rhinoceros found in Vietnam, and dating way back, seem to bear similarities to rhinos once extent in Europe. This suggests SE Asia played an important role in the evolution of mammals – in the Eocene. Does it also mean that SE Asia at that time had a climate somewhat different than nowadays? Also, how large was SE Asia – was the Indonesian continental shelf dry land?