Rod M.
This book is wonderful. I can't believe I haven't read it. Because I had seen the movie I wasn't expecting much. I wish they would do a TV Mini series in 3 parts of the trilogy!
The Land That Time Forgot is a science fiction novel, the first of Edgar Rice Burroughs' Caspak trilogy. His working title for the story was "The Lost U-Boat." Starting out as a harrowing wartime sea adventure, the story ultimately develops into that of a fantastical lost world. (Adapted from Wikipedia.)