Now, since Arthur C. Clarke claims that "any sufficiently advanced technology is indistinguishable from magic", this distinction also becomes blurred, and the area in which it is most blurred is Science Fantasy. Here, we find the props that are typical for Fantasy explained in a manner typical for Science Fiction: monsters become aliens, and magic artefacts become relics of forgotten science.
The Martian stories of Leigh Brackett might be regarded as Science Fantasy, as well as M. John Harrison's Viriconium novels, or Gene Wolfe's Book of the New Sun. Many works by Edgar Rice Burroughs, especially his Barsoom novels, clearly fall into this category.