Anthropology

but this was a team effort, likely 3-5 men per log. You might have stumbled, but the log would have prevented a fall by providing something to grab. The line would have been slacked off, the weight borne by the guys who didn't stumble.

Chaco was a huge trading center, drawing tribes from hundreds of miles away. There were trails that turned into wide roads but no navigable rivers, no wheels, no pack animals, just people hauling their merch to where they could exchange it for something people back home would appreciate.