The Mirador cave is located in the Sierra de Atapuerca (Ibeas de Juarros, Burgos, Spain). This site represents an extensive archaeo-paleontological sequence extending from the latest Pleistocene to the ancient Holocene. In this paper we have studied the latest Pleistocene levels, MIR50 and MIR51. The palaeoenvironmental and palaeoclimatical data obtained with the small mammal assemblage show that the level MIR51 may be probably related with a cool moment from the end of the latest Pleistocene. Taking into account, the absolute dating for this level, this moment could be corresponds to the Heinrich Event 1 (H1). This event, dated between 14,000 to 16,000 years BP, is globally characterized for being a generally cold moment, as detected at the level MIR51, but with small peaks of climatic amelioration, as it is detected in the level MIR50
