<P> The Chacoan structures altogether required the wood of 200,000 coniferous trees, mostly hauled--on foot--from mountain ranges up to 70 miles (110 km) away . </P> <P> One of the most notable aspects of Ancestral Puebloan infrastructure is at Chaco Canyon and is the Chaco Road, a system of roads radiating out from many great house sites such as Pueblo Bonito, Chetro Ketl, and Una Vida . They led toward small outlier sites and natural features within and beyond the canyon limits . </P> <P> Through satellite images and ground investigations, archaeologists have detected at least eight main roads that together run for more than 180 miles (300 km), and are more than 30 feet (10 m) wide . These were excavated into a smooth, leveled surface in the bedrock or created through the removal of vegetation and soil . The Ancestral Pueblo residents of Chaco Canyon cut large ramps and stairways into the cliff rock to connect the roadways on the ridgetops of the canyon to the sites on the valley bottoms . </P> <P> The largest roads, constructed at the same time as many of the great house sites (between 1000 and 1125 AD), are: the Great North Road, the South Road, the Coyote Canyon Road, the Chacra Face Road, Ahshislepah Road, Mexican Springs Road, the West Road, and the shorter Pintado - Chaco Road . Simple structures like berms and walls are found sometimes aligned along the courses of the roads . Also, some tracts of the roads lead to natural features such as springs, lakes, mountain tops, and pinnacles . </P>

Which one of the following is not a description of anasazi communities