 The concentration of artifacts discovered by Dr. Beyer might be an indication of habitation.In the present day San Francisco del Monte area, an extensive deposition of damaged polished adze were found with wornout flake tools mode of obsidian, or volcanic glass and tektites.In the San Juan River area, Dr. Beyer recognized what could have been an ancient trading center, and perhaps small communities on both banks of the river and at the creek that entered the river at one point.