How old are the flint tools discovered at the Belvedere quarry near Maastricht?

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The flint tools discovered at the Belvedere quarry near Maastricht are dated to approximately 250,000 years before the present (bp). These artifacts, which demonstrate the Levalloisian stone-flaking technique, represent the earliest well-dated evidence of human habitation in the region and correlate with an early interstadial period during the Saale Glacial Stage.1