The People that Time Forgot by Edgar Rice Burroughs
The People that Time Forgot (1918) is the second novel in Edgar Rice Burroughs’ CASPAK trilogy. In the first installment, The Land that Time Forgot, Bowen Tyler gets stranded on Caspak, a lost world where prehistoric animals and subhuman people exist. The story picks up in The People that Time Forgot as Bowen’s friend Tom Billings decides to go looking for him. When Tom lands on Caspak, he doesn’t have much time to search for his friend because it takes all his effort just to survive.