(NEWSER) – For nine decades, it's been established that many of Stonehenge's smaller rocks hail from the Preseli Hills in Wales. Now, a newly published study says that we've been wrong about an outcrop that has been accepted as a specific source since 1923. And the new research, published in February's issue of Journal of Archaeological Science, suggests the rocks—known as bluestones, of which there are many types—may not have been transported there by humans at all. As head researcher Dr. Richard Bevins explains, in 1923, geologist H.H. Thomas identified Carn Meini as the source of spotted dolerite bluestones, but a new analysis of the rocks' chemical makeup has fingered Carn Goedog as the true home of at least 55% of those used at Stonehenge, reportsPlanet Earth.