Revision of TD1 and TD2 stratigraphic sequence of Gran Dolina cave (Sierra de Atapuerca, Spain)

Abstract Gran Dolina is a cavity infilled by at least 25 m of Pleistocene sediments divided into 12 lithostratigraphic units and 19 sedimentary facies. These facies have been allochthonous facies, defined as sediment inputs from the outside, autochthonous generated within karst; but this division has challenged in recent works. In study, TD1 TD2 detailed studied use assessed. For that purpose, we stratigraphic excavation profile, combining field observation with laboratory analysis (sieving, laser diffraction, XRD) to characterize texture structure sediments. Based on these studies, total 8 identified. Consequently, unit separated two sub-units 13 layers, while three sub-units. The associations indicate succession phreatic vadose phases would define together epiphreatic conditions inside cave, related transition between Arlanzón valley terraces T3 T4. Interior (and entrance for facies) proposed Dolina's since analyses transport underground flows.