Earliest main phase of settlement in the Tehuacán Valley of Mexico, dating to 9500–7000bc. This phase was characterized by Palaeo‐Indian communities using spears with leaf‐shaped points to hunt horse, antelope, and deer. The tool kit is dominated by butchering and hide‐working equipment. In the early part of the phase there is little evidence for the use of plant resources; the exploitation of the valley seems to have involved small mobile hunting groups. About 8000 bc, horse, antelope, and several other animal species became extinct, perhaps because of over‐hunting, forcing the population to greater reliance on plant food.