He studied the fossils' age and how tall the mountains are. He also studied how old they are. I don't know about Coal Beds but he also used balloons to find out the continents were once a big supercontinent called Pangaea and they apparantly drifted apart
USA, UK, France & USSR
Berlin was also split into four and each of the four above also had their own sections of Berlin- however the Capitalists (USA, UK & France) all banded together to make a stronger nation, making their own new currency and building the economy from scratch; this is what triggered the Berlin Blockade & Airlift
Answer: They lived in Central America.
Explanation: Hope this helps :D
United States France China United Kingdom’s Soviet Union