The only features that distinguish these from either of the other structures are the immense thickness of the walls, which reaches as much as five feet, and the great height of the buildings.

The material, too, is different, consisting of enormous bricks made of mud mixed with coarse gravel, and formed in baskets or boxes.
A striking fact is that the houses apparently are not arranged in accordance with any laid-out plan or regularity.

Nevertheless they looked extremely picturesque, viewed from the east as the sun was setting.

I camped for a few days on top of the highest mound, between the ruined walls.
No circular building, nor any trace of a place of worship, could be found.

The Mexicans, some of whom have nestled on the eastern part of the ruins, have from time to time come upon beautiful jars and bowls, which they sold to relic hunters or used themselves.