Show tree rings to fix date of remote civilization reports ISep oits of success have been made from the national geographic society socie tys s expedition into the southwest which Is endeavoring to fix the date definitely of a remote civilization which w undoubtedly existed this Is being done by a study of tile the tree rings as found in some timbers of the ancient structures this work will ft enable the scientists to date the period when the complex and highly developed civilization of chaco canyon produced the beautiful village pueblo bonito a communal dwelling of some 2500 people centuries before the white man set toot foot on american soll soil the mementos of a civilization which rivaled those of the ancient old world culture of the Bon itans apparently knew nothing have already been brought to washington froin year to year but always there was the perplexing question illow old are they by bv minute study and comparisons of the rings of the timbers uncovered and old trees and stumps of the vicinity it Is hoped limped to arrive an he at a very accurate date |