In the unmapped Antarctic seas lay Caspak, the continent whose towering, rockbound coastline had kept it in eons-long isolation. But now adventurer Bowen Tyler was lost in this mysterious land where time had stopped andthe monstrous creatures of long-dead epochs battled each other for supremacy.

tom Billings had traced his missing friend as far as Caspak, but no sooner had he arrived there than a wild duel with a giant pterodactyl stranded him, unarmed, in a landscape of a thousand dangers.
Spurred on by determination to rescue Tyler - and by newfound love for the beautiful Ajor, daughter of Earth's Dawn Age - he matched his courage against mammoth dinosaurs an d fearsome cave cavemen.
But could he match wits against the awesome mystery that ruled the forgotten land?

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UNFRIENDLY SKIES

I saw a most terrific creature sweeping down on me. Fully eighty feet long from the end of its hideous beak to the top of its thick, short tail, it was coming straight for me and hissing frightfully - I could hear it above the whir of the propeller. the creature dived for my right wing so quickly that nothing but a sheer drop could have saved me. I was making the maneuver successfully when I saw I was approaching a large tree. My effort to dodge the tree and the pterodactyl at the same time ended disastrously. The plane dashed into the branches, where it came to rest forty feet above the ground ...