Description: The Station in the title is a prison colony created in the pre-Cambrian era by means of a time machine invented by an eponymous Dr. Hawksbill. A time machine is used by an oppressive government for deporting political prisoners a billion years in the past, to the Pre-Cambrian era. Hawksbill Station is a penal colony in the Precambrian era created by the authoritarian United States government, using time travel as a means to exile rebels and political dissidents into the past. The colony houses only male exiles (a female settlement supposedly exists later in the Silurian Period), who are sent there as a "humane" alternative to execution. The machine only works one way, so the prisoners are hopelessly marooned in the past.