The first radiocarbon datings (C-14) were obtained by accelerator mass spectrometry (AMS) on samples taken in 1995 and 1996. The dates range between 31,900 ± 460 and 30,300 ± 570  years ago and relate to five different drawings rich in charcoal pigments and located in three adjacent chambers: the Hillaire Chamber for the two "fighting" rhinoceroses on the Panel of the Horses, dated respectively to 32,410 ± 720, 30,790 ± 600 (right-hand rhinoceros) and 30,940 ± 610 years ago (left-hand rhinoceros), and the Alcove of the Lions for the running cow, dated to 30,230 ± 530 years ago. The two other samples were taken from the large megaloceros located at the entrance to the Megaloceros Gallery, which is dated to 31,350 ± 620 years ago and finally from the large bison in the End Chamber, dated to 30,340 ± 570 years ago. These six C-14 dates fall into the same time interval, from 32,000 to 30,000 years ago. The calendar interval deduced from these dates is from 38,000-33,400 years calBP (calibration with IntCal 13 to 95%).