This SfM model is one of a three part glimpse into archaeology and the process of excavation from Bonfire Shelter in the Lower Pecos region of Texas. Bonfire Shelter is the earliest and southernmost Native bison jump in North America. This mass of bone to the left and underneath the large boulder is a grouping of Bison antiquis (extinct bison) bones and mandibles (lower jaw). The large boulder in the model might have been used by humans as an anvil to break open the bison longbones for marrow extraction. The SfM model following this one shows the excavation starting from the sediment deposit above, down to this level.