When excavated they disclosed the remains of houses of a type similar to that of the cave-dwellings.

Some of the mounds were high enough to justify the supposition that the houses had two stories, each six or seven feet high, and containing a number of rooms.

From the locality in which the mounds were found it becomes at once evident that the houses which once stood there were not destroyed by inundations and covered by diluvial deposits.

The mounds are composed of gravelly cement and fine debris of house walls, and the rooms left are completely filled with this material.

It is easy to imagine how the mounds were formed by the gradual demolition of the ceilings, plastering, and roofs, forming a heap which to-day appears as shapely as if it had been made by man for some definite purpose.
The houses were communal dwellings, each consisting of one room, which generally was not quite ten feet square.