The Land That Time Forgot, by Edgar Rice Burroughs
Edgar Rice Burroughs, best known for his Tarzan and Mars series of books, also created the lost island of Caprona, where American Tyler Bowen is stranded in a lost world where prehistoric animals and people have flourished unchanged since the beginning of time.
Edgar Rice Burroughs (September 1, 1875 – March 19, 1950) was an American author, best known for his creation of the jungle hero Tarzan and the heroic Mars adventurer John Carter, although he produced works in many genres.
Burroughs took up writing full-time and by the time the run of Under the Moons of Mars had finished he had completed two novels, including Tarzan of the Apes, which was published from October 1912 and went on to begin his most successful series. In 1913, Burroughs and Emma had their third and last child, John Coleman.
Burroughs also wrote popular science fiction and fantasy stories involving Earthly adventurers transported to various planets (notably Barsoom, Burroughs' fictional name for Mars, and Amtor, his fictional name for Venus), lost islands, and into the interior of the hollow earth in his Pellucidar stories, as well as westerns and historical romances. Along with All-Story, many of his stories were published in the Argosy Magazine.