The Time Ray of Jandra

Sylvester Gale, shipwrecked on the west coast of Africa, discovers a long lost civilization and finds himself back there, but unable to interact; when the civilization’s scientists manage to set off a lava explosion, Gale is thrown forward, but overshoots his original time of 1944 by 13 years.

This is the first published story of fan, writer and long-time editor Raymond A. Palmer.