Prehistoric Fiction is a science fiction subgenre in which the story is set in the ages prior to the existence of written records, generally known as prehistory. A span of time that may include as its fictional setting the three periods of Stone Age; the Paleolithic, Mesolithic or Neolithic as well as the Metal Ages. Even earlier periods of the Cenozoic and Mesozoic have been the subject of fiction including extinct mammals and dinosaurs. As a literary genre the description of the subjects can vary widely, from the realistic to the fantastic, without necessarily having any commitment to developing an objective anthropological, archaeological or paleontological account. Because of this, a given author of prehistoric fiction will often deal with their subjects with more creative license than the author of serious historical fiction. The genre also has connections with speculative fiction. In many such narratives for instance, humans and dinosaurs live together, despite the extinction of the dinosaurs and the evolution of humans being separated by tens of millions of years. The paleontologist, academic and author Björn Kurtén coined the term "paleofiction" to define his works. One of the newer derivatives and subgenres of Cyberpunk is Stonepunk. Stonepunk is a neologism born from the contraction between a stone and cyberpunk. This is an uchronia that refers to the incongruous use of high technology in prehistoric times. Source: Wikipedia (en)