What literary movement would you assign Edgar Rice Burroughs to?

I’ve browsed the Wikipedia list of literary movements and haven’t been able to pin him down very well.

I’m particularly thinking about his use of mundane humans as a sort of an all-around superhuman, in the stories of his that I am familiar with (the Tarzan and Barsoom series, the first having a guy tough enough to rule the apes and bright enough to teach himself written English while lacking any sort of proper language, and the other a guy whose terrestrial origins let him outclass everybody on Mars).

Do his works not even fit?