New radiocarbon dating of objects found in French caves, previously tentatively attributed to Neadertals, proves them to have been created long after Neandertals died out. (Michael Balter, "A Setback for Neandertal Smarts", Science Mag Daily, October 19, 2010.)
Whatever the current evidence, I think that eventually Neandertals and prehuman primates will be found to have had capability to create objects with symbolic significance. The Neandertals had far too much brain power for symbolic behavior to have been out of their reach. Current studies of primates and high mammals are on the verge of demonstrating this capability now. A purely darwinian view of evolution of humans would find in prehumans traces of human capabilities--continuity, not discontinuity, is the rule.