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Ice sheets provide exceptional archives of past changes in polar climate,\udregional environment and global atmospheric composition. The oldest dated\uddeep ice core drilled in Antarctica has been retrieved at EPICA Dome C (EDC),\udreaching ∼ 800 000 years. Obtaining an older paleoclimatic record from\udAntarctica is one of the greatest challenges of the ice core community. Here,\udwe use internal isochrones, identified from airborne radar coupled to\udice-flow modelling to estimate the age of basal ice along transects in the\udDome C area. Three glaciological properties are inferred from isochrones:\udsurface accumulation rate, geothermal flux and the exponent of the Lliboutry\udvelocity profile. We find that old ice (> 1.5 Myr, 1.5 million years)\udlikely exists in two regions: one ∼ 40 km south-west of Dome C along\udthe ice divide to Vostok, close to a secondary dome that we name <q>Little\udDome C</q> (LDC), and a second region named <q>North Patch</q> (NP) located\ud10–30 km north-east of Dome C, in a region where the geothermal flux is\udapparently relatively low. Our work demonstrates the value of combining radar\udobservations with ice flow modelling to accurately represent the true nature\udof ice flow, and understand the formation of ice-sheet architecture, in the\udcentre of large ice sheets

Is there 1.5-million-year-old ice near Dome C, Antarctica?