For discussion regarding the term strata as used in geology, see stratum. See also Strata (disambiguation).Strata is a science fiction novel by Terry Pratchett. Published in 1981, it is one of Pratchett's first novels and one of the few purely science fiction novels he wrote, along with The Dark Side of the Sun and The Nome Trilogy.
Although it takes place in a different fictional universe and is more science fiction than fantasy, it could be said to be a kind of precursor to the Discworld novels, as it also features a flat Earth similar to the Discworld. It has been called a "preconsideration" of Discworld, though the plot and characters are modelled on (or parodies of) the novel Ringworld by Larry Niven.
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date of publication: 1981
genre: science fiction novel