I'm pretty sure that in any reasonable archaeological context you're always going to have some prior information. (climateaudit.org)
Antiquities bereft of archaeological context have lost much of their cultural meaning, function, and probable dating. (ncartmuseum.org)
Binghamton University, which had an anthropologist on the international team that made the discovery, said in a statement that the newly uncovered cranium is strongly tagged to 400,000 years ago, which sets it apart from other similar fossils that «are poorly dated or lack a clear archaeological context.» (ibtimes.com)