
However, models on population dynamics in this area are probably biased by the poor quantity and quality of data available, especially for the Upper Palaeolithic. This has been traditionally explained as a consequence of the harsh ecological conditions of the Spanish plateau during the Last Glaciation, until the retreat of the Last Glacial Maximum. For years, it has been assumed that a population hiatus existed in Central Iberia from the Late Middle Palaeolithic to the final stages of the Upper Palaeolithic.
