The Wold Newton family is a literary concept derived from a form of crossover fiction developed by the science fiction writer Philip Josť Farmer. Farmer suggested in two fictional "biographies" of fictional characters (Tarzan Alive and Doc Savage: His Apocalyptic Life), that the (real) meteorite which fell in Wold Newton, England, on December 13, 1795 was radioactive and caused genetic mutations in the occupants of a passing coach. Many of their descendants were thus endowed with extremely high intelligence and strength, as well as an exceptional capacity and drive to perform good, or, as the case may be, evil deeds. The progeny of these travellers were purported to have been the real-life originals of fictionalised characters, both heroic and villainous, over the last few hundred years, such as Sherlock Holmes, Tarzan, Doc Savage, and Lord Peter Wimsey.
If anyone is intersted in this here is a link to a very comprehinsive site devoted to the Wold-Newton familyhttp://www.pjfarmer.com/woldnewton/Pulp.htm
the guy has even wrote a book!