New radiometric dates on the lowest stratigraphical section (TD1 to TD6) of Gran Dolina site (Atapuerca, Spain) - Moreno García, Davinia; Falguères, Christophe; Pérez-González, Alfredo; Voinchet, Pierre; Ghaleb, Bassam; Despriée, Jackie; Sala, Robert; Carbonell, Eudald; Bermúdez de Castro, José María; Arsuaga, Juan Luis (2015)