Valley of the Dragons (1961)

Algeria 1881. Two men, Michael Denning and Hector Servadac are having a duel with one another when a comet goes past the earth at low altitude. The strong wind this creates transports the two men to the moon. They find themselves in a jungle inhabited by reptiles and prehistoric humans. They have a difficult time before they manage to adapt to the dangers, but eventually they each find a girl to spend time with, awaiting the next return of the comet to take them back to Earth.