Viewing the collection
The current collection may be view through two lenses: Chronologically and by location. In a sense however the location view is also roughly chronological. Lost worlds were first placed by their authors beneath our very feet. As exploration revealed more of the world, makers of lost worlds placed their creations just beyond the edge of the unknown; at the poles, on distant islands, atop forbidding plateaus, among remote valleys and deep within vast continents. When all the world seemed known so the depths of space and other dimensions were called into service.

About the collection
This collection does not include every fictional lost world featuring "dinosaurs". It favors those from books, film and comics. It also focuses on the first appearance of a title (e.g. "The Lost World" novel by Conan Doyle) but may not represent every subsequent adaptation or derivation of that work visually. We've also applied a certain expectation of originality so the many lost world films that recycled footage from One Million B.C. (1940) (itself a film set in prehistoric times) e.g. Untamed Women, Valley of the Dragons and Island of the Dinosaurs (La Isla De Los Dinosaurios) are likewise omitted. Despite including such footage, a dubious film for other reasons, King Dinosaur (1955), makes the cut because it does contain significant original footage. Also included are what some may consider creatures that are only marginally dinosaurian. These include the obviously intended exosaurians the Ymir from 20 Million Miles to Earth (1957) and the homicidal Martian monster from It! The Terror From Beyond Space (1958). Some may also argue that a film like The Beast of Hollow Mountain (1956) is a dinosaur-on-the-loose film rather than of the Lost World subgenre. It is included here because, though poorly defined in the movie, "Hollow Mountain" is an isolated location that the beast is associated with in the same way that Gwangi is with its remote Forbidden Valley.