visit an inside-out world in their continua craft and discuss whether they have reached Pellucidar. In John Crowley's Little, Big (1981), a drug named Pellucidar is mentioned and appears to have an exhilarating and even aphrodisiac effect. During the initial explorations of Lechuguilla Cave in the late 1980s, a chamber was named "Pellucidar" in honor of these stories. In Philip José Farmer's "Riders of the Purple Wage", there is a concept known as "the Pellucidar Breakthrough". In Roderick Gordon's Tunnels series, the Garden of the Second Sun is strongly based on Pellucidar. The Hollow Earth concept was used by Vladimir Obruchev in his novel Plutonia, published in 1924, also inhabited by ancient life forms. Due to his scientific and geology career, Obruchev was not a fan of the Hollow Earth concept. However, Obruchev did use his novel to describe Pleistocene, Jurassic, and Carboniferous fauna. See also At the Earth's Core (1976 movie) Tarzan: The Epic Adventures (1996/1997 TV series) Caprona Hollow Earth Subterranean fiction References External links Official site from Edgar Rice Burroughs, Inc., Tarzana, California von Horst's Pellucidar—Articles, book summaries, publishing histories, pastiches, glossary, languages, maps, hollow Earth theory, and film and TV reviews by Pellucidar scholar David Critchfield. Maps of Pellucidar in ERBzine'' 3042 Beasts of Pellucidar at Angelfire Pellucidar at Comic Vine Book series introduced in 1914 Fictional elements introduced in 1914 Edgar Rice Burroughs locations