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A fantasy novel by Creator/EdgarRiceBurroughs, ''The Land That Time Forgot'' is the first of his Caspak trilogy first published in ''Blue Book Magazine'' as a three-part serial in the issues for September, October and November of 1918. In June 1924, Chicago based publisher A. C. [=McClurg=] combined the complete trilogy for publication in book form, simply known as ''The Land That Time Forgot''. The three segments are now usually issued as separate short novels beginning with the Ace Books editions of the 1960s. The sequels are titled ''The People That Time Forgot'' and ''Out of Time's Abyss''.

Though ''The Land That Time Forgot'' starts out as a harrowing wartime sea adventure taking place during UsefulNotes/WorldWarI, the story ultimately develops into a LostWorld story reminiscent of such novels as Creator/JulesVerne's ''Literature/JourneyToTheCenterOfTheEarth'' and Creator/ArthurConanDoyle's ''Literature/{{The Lost World|1912}}''. Though Burroughs added his own twists by postulating an unique biological system for his lost world where slow evolution in the world outside is recapitulated as a matter of individual metamorphosis, presented as a mystery whose explication is gradually worked out over the course of the next two novels, forming a thematic element serving to unite three otherwise rather loosely linked stories.

The novel was adapted into a [[Film/TheLandThatTimeForgot 1975 fantasy/adventure film]] produced by Britain's Creator/AmicusProductions, where it became a {{sleeper hit}}, inspiring Amicus to make a sequel, ''The People That Time Forgot'', as well as an adaptation of another Burroughs novel, ''Literature/AtTheEarthsCore''.

In 2009, American independent film studio Creator/TheAsylum released a science-fiction film based on the aforementioned Burroughs novel and a [[TheRemake remake]] of the 1975 film, promoted under the title ''[[InCaseYouForgotWhoWroteIt Edgar Rice Burroughs']] The Land That Time Forgot'' and released in other countries as ''Dinosaur Island''. Despite the title, the film is a rip-off of ''Film/LandOfTheLost''.

In 2016, comic book studio American Mythology Production produced the ''ComicBook/TheLandThatTimeForgot'', which was touted as a sequel to the original books. This was followed by a never-completed tie-in series, ''See-ta the Savage'', in 2018.
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!!''The Land That Time Forgot'' trilogy provides examples of:

* AlwaysChaoticEvil: The Weiroos, whose culture revolves around raiding the Galu tribe for women, who are kept as breeding slaves, and murderous intercine squabbles over power, prestige, and access to breeding slaves.
* AristocratsAreEvil: Friedrich von Schoenvorts, the German lieutenant in command of the U-Boat, is also a baron. He commits war crimes and is a BadBoss to his crew (whipping them for minor offenses). Burroughs uses him as an example of what Bowen Tyler describes as being "the Kaiser Breed," expressing contempt for German nobility.
* BornInTheWrongCentury: Tom Billings, in ''The People That Time Forgot'', finds that he's more comfortable on Caspak than he was in the civilized 20th century.
* DumbDinos: The dinosaurs are of the standard violent, feral variety.
* EvolutionaryLevels: In Caprona, each individual begins as a tadpole-like creature and slowly evolves over its lifetime until it reaches its proper niche where it stops. The one exception are the humans at the peak of this ladder, some of whom have reproduced the normal way.
* FrazettaMan: The lower ranks of the Capronan HumanSubspecies are distinctive examples of that pulp-borne category of ape-men.
* HumanSubspecies: Caprona is home to seven different strains of humanity, consisting of a sextet that embody the EvolutionaryLevels from FrazettaMan to modern human, and a parasitic ofshoot race.
** The '''Alu''' are the bottom tier of the human ladder on Caprona; a small and feral race of bipedal, non-brachiating primates with no verbal language and no grasp of technology.
** The '''Bo-lu''' are more advanced than the Alu, having grasped at least the basic concept of using clubs. Their womenfolk no longer have hairy faces, although the rest of their bodies are still covered in fur.
** The '''Sto-lu''' are mostly Neanderthal-like, but slightly more primitive, with a distinctly ape-like arm-length. They have mastered fire and primitive stone tools, favoring the use of stone hatchets, and speak a language of single-syllable words.
** The '''Band-lu''' resemble Cro-magnons, and have mastered a language of two-syllable words.
** The '''Kro-lu''' are a higher breed than the Band-lu, having progressed to an agrarian lifestyle. They are also known as the Bow People, for they have learned the art of ranged weapons.
** The '''Galu''' are the most advanced race on Caprona, physically resembling modern-day humans and with a Bronze Age level of technology.
** The '''Wieroo''' are a parasitic species of monstrous [[BatPeople bat-winged flying men]] with PsychicPowers. A OneGenderRace consisting entirely of males, they reproduce by abducting Galu women and keeping them as sex slaves.
* IChooseToStay: Tom Billings at the end of ''The People That Time Forgot''.
* ImAHumanitarian: Co-Tan's brother An-Tak, who has been imprisoned by the Wieroos for so long that he has become an insane cannibal and tries to eat Bradley.
%%* IslandOfMystery: The uncharted island of Caprona.
* LaserGuidedKarma: Baron von Schoenvorts [[DrivenToSuicide drives one of his men to suicide]] and brutally whips another for a minor offense. Near the end of ''Out of Time's Abyss'', Plesser, the guy he whipped, [[BodyguardBetrayal kills him]] by stabbing him to death with a bayonet during a battle.
* LikeADuckTakesToWater: Tom Billings, the hero in ''The People That Time Forgot'', adapts to life very easily in the primeval LostWorld of Caspak and elects to stay there with the woman he loves.
* LostWorld: The Land of the title, an island somewhere in the vicinity of MysteriousAntarctica and home to prehistoric creatures.
* MarsNeedsWomen: The Wieroos are an all-male race of winged humanoids, and they reproduce by kidnapping cavewomen from the interior.
* MessageInABottle: The FramingDevice is that the book is derived from a manuscript found afloat in the ocean in a thermos flask.
* {{Metamorphosis}}: All the creatures on the island are evolving from one species to another as they move inland and northward.
* MysteriousAntarctica: The tropical LostWorld Caspak is located on a large island in the vicinity of Antarctica.
%%* OffWithHisHead: How Bradley kills He Who Speaks For Luata.
* PrehistoricMonster: Many of the creatures found on Caspak, including a ''Tyrannosaurus'' depicted as an armor-plated dragon that eats its victims with its [[ScienceMarchesOn three-fingered hands]].
* TheVonTropeFamily: Baron Friedrich von Schoenvorts is a sadistic autocrat.
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