Out of Time's Abyss

Out of Time's Abyss Edgar Rice Burroughs - Out of Time's Abyss is a direct sequel to The Land That Time Forgot and The People That Time Forgot, continuing the lost world saga begun in the earlier stories. It connects the previous two installments, bringing in characters introduced in each. Burroughs completes the revelation of his lost world's unique biological system, hinted at in the previous installment, in which the slow progress of evolution in the world outside is recapitulated as a matter of individual metamorphosis.
This system forms a thematic element serving to unite the three linked Caspak stories. Out of Time's Abyss is a science fantasy novel by American writer Edgar Rice Burroughs, the third of his Caspak trilogy. The sequence was first published in Blue Book Magazine as a three-part serial in the issues for September, October and November 1918, with Out of Time's Abyss forming the third installment.
The complete trilogy was later combined for publication in book form under the title of The Land That Time Forgot (the title of the first part) by A. C. McClurg in June 1924. Beginning with the Ace Books editions of the 1960s, the three segments have usually been issued as separate short novels.