The Caspak Series

Burroughs classic series with an active table of contents. Caspak is described as a land mass near Antarctica. The island is ringed by high cliffs, making it inaccessible to all but the most intrepid explorers. It has a tropical river teeming with primitive creatures extinct elsewhere and a thermal inland sea, essentially a huge crater lake.

Burroughs creates an unique biological system for his lost world, in which the slow progress of evolution in the world outside is recapitulated as a matter of individual metamorphosis. 

Caspak is featured in several films, including 1975 and 1977 Amicus Productions' adaptations of The Land That Time Forgot and The People That Time Forgot, and in the 2009 Asylum adaptation of The Land That Time Forgot, although the Asylum version re-imagines the island as existing within the Bermuda Triangle.

Included books:
The Land That Time Forgot
The People That Time Forgot 
Out of Time’s Abyss