21The essential relationship to fat in the Middle Paleolithic, and especially to the yellow 22 42 an innovative GIS (Geographic Information System) method to analyze the distribution of 43 percussion marks to highlight recurrent patterns. 44 One of the most significant results of our article shows the existence of significant concentrations of 45 percussion marks, regardless of the volunteers' behaviour during bone fracturing. The predominance of 46 two factors explains the distribution patterns that emerge from our analysis: for humerus, radio ulnas 47 and tibias, the morphology of each element seems to constrain the location of percussion marks, while 48 for femurs, individual choices have more weight in this distribution. In addition, we have observed that 49 at different levels of our analyses, the bone response to fracturing may be totally opposite (quantity of 50 bone marrow, marrow quality, number of blows, difficulty felt, number of fragments produced, type of 51 marks registered), particularly regarding the results for radio-ulnas and tibias. Subsequently, it would be 52 most interesting to compare the intuitive models that we were able to highlight through spatial analysis 53 with the distributions of percussion marks registered in fossil assemblages. It would thus be possible to 54 propose new hypotheses on butchering practices based on the results presented in this work. 55