At the top of this hill 3 to 5000 years ago, prehistoric people operated a rock quarry where they made a variety of stone tools, including projectiles, knives, and scrapers, while camping at the foot of the hill. These nomads hunted dear and other game, collected plant foods, and fished in the river here. They used spears and spear throwers for hunting and fishing, and motors and pestles for grinding roots and berries. Archaeologists have not yet determined when this industry shut down.